Popular Computers Books

Here's everything you need to know about iPad, in a handy digital format. Get to know iPad and discover all the amazing things it can do, and how ...

Here’s everything you need to know about iPad. Get to know iPad and discover all the amazing things it can do, and how to do them. It’s the defini...

Mac mini Essentials provides everything you need to quickly set up and start using your new Mac mini. Learn how many external displays Mac mini can co...

This is an iBooks version of an official Python 3 Tutorial by Python Software Foundation. Python is an easy to learn, powerful programming language. I...

Free books, all you can eat! One of the best things about Amazon's Kindle system is that many popular books are offered completely free of charge duri...

There are 4 key areas to the interface that I use day in, and day out, that is it, just 4.  I will show you how I can get anywhere I need to on t...

The course is devoted to creation of 64-bit applications in C/C++ language and is intended for the Windows developers who use Visual Studio 2005/2008/...

MacBook Air Essentials provides all the information you need to set up and start using your new MacBook Air. Learn about the hardware and included app...

MacBook Pro Essentials provides everything you need to quickly set up and start using your new MacBook Pro. Learn about the hardware, as well as how t...

Here’s everything you need to know about iPad, straight from Apple. This definitive guide helps you get started using iPad with iPadOS 15 and discov...

Here's everything you need to know about iPhone, in a handy digital format. Get to know iPhone and discover all the amazing things it can do, and ...

MacBook Pro Essentials provides everything you need to quickly set up and start using your new MacBook Pro and included apps. Learn about useful tools...

This open access book constitutes the refereed proceedings of the 16th International Annual Conference on Cyber Security, CNCERT 2020, held in Beijing...

Here’s everything you need to know about Keynote for Mac, straight from Apple. This definitive guide helps you create and deliver polished presentat...

As the banking industry enters a period of profound and probably difficult change, not only do the world's banks face a tidal wave of post-crisis regu...

Here’s everything you need to know about iPhone, straight from Apple. This definitive guide helps you get started using iPhone and discover all the ...

Here's everything you need to know about iPhone, in a handy digital format. Get to know iPhone and discover all the amazing things it can do, and ...

This book makes life easier by breaking through the jargon. It was written by a Senior for Seniors. It is geared for Australian users but is easily ad...

Here's everything you need to know about iPhone, in a handy digital format. Get to know iPhone and discover all the amazing things it can do, and ...

Students build fundamental iOS app development skills with Swift. They’ll master the core concepts and practices that Swift programmers use daily an...

Here’s everything you need to know about iPhone. Get to know iPhone and discover all the amazing things it can do, and how to do them. It’s the de...

This IBM® Redbooks® publication explains how to create various applications based on Node.js, and deploy and run them on IBM Cloud. This book includ...

This open access book presents the first comprehensive overview of general methods in Automated Machine Learning (AutoML), collects descriptions of ex...

This book provides editorial guidelines for text in Apple materials. Apple developers and third-party developers should follow this guide for customer...

Description Learn Html fundamentals with simple and easy to understand language. This book is for absolute Beginners.

Here's everything you need to know about iPhone, in a handy digital format. Get to know iPhone and discover all the amazing things it can do, and ...

Here’s everything you need to know about iPad, straight from Apple. This definitive guide helps you get started using iPad with iPadOS 14 and discov...

Your guide to the 365 must have apps for IPhone and iPad. Get work done, play games, get in shape, explore new cities, and stay in touch with friends....

Here’s everything you need to know about iPad, straight from Apple. This definitive guide helps you get started using iPad and discover all the amaz...

Let's create our own password system which can be used anywhere for all of the passwords we will ever need. We want to make them easy to formulate yet...

Read this book on any device! >>MARKETING COURSE INSIDE!<< Are you ready to tap into one of the most effective and easy ways to make ...

Here’s everything you need to know about Mac Studio, straight from Apple. This definitive guide helps you quickly set up and start using your new Ma...

"Building Your First Personal Computer" is exactly what it implies! You will find simple, concise information on computer hardware, parts purchasing t...

Here’s everything you need to know about iPhone, straight from Apple. This definitive guide helps you get started using iPhone and discover all the ...

Top 5 Beginner-Friendly Strategies to Get You Into Metaverse Investing Today! - Bring in a Fortune and Finally Reach Financial Freedom With This Book ...

Aquí encontrarás todo lo que necesitas saber sobre el iPhone, directamente de Apple. Este manual te ayudará a empezar a usar tu iPhone con iOS 15 y...

If you're looking to gain an introduction into the world of user experience (UX) design—or maybe even freshen up your knowledge of the field—then ...

Managing Risk and Information Security: Protect to Enable, an ApressOpen title, describes the changing risk environment and why a fresh approach to in...

Here’s everything you need to know about iPhone, straight from Apple. This definitive guide helps you get started using iPhone with iOS 14 and disco...

Here’s everything you need to know about Numbers for iPad, straight from Apple. This definitive guide helps you create organized spreadsheets using ...

Here’s everything you need to know about iPod touch, straight from Apple. This definitive guide helps you get started using iPod touch with iOS 15 a...

O objetivo geral deste trabalho será apresentar, a nova tecnologia conhecida pelo nome de Raspberry Pi , tentando levar ao pormenor as suas caracter�...

Here’s everything you need to know about Apple TV, straight from Apple. This definitive guide helps you get started using Apple TV and discover all ...

Here's everything you need to know about iPad, in a handy digital format. Get to know iPad and discover all the amazing things it can do, and how ...

Here’s everything you need to know about Pages for Mac, straight from Apple. This definitive guide helps you create beautiful documents and interact...

Here’s everything you need to know about Apple Watch and the Apple Watch app on iPhone, straight from Apple. This definitive guide helps you get sta...

Raspberry Pi Insider Guide: Everything you need for the Model B/B+ and more Taking You from beginner to Expert! The most up-to-date Raspberry Pi guide...

Here’s everything you need to know about Apple Watch and the Apple Watch app on iPhone, straight from Apple. This definitive guide helps you get sta...

A brief look at the new features in the Apple Watch Series 6 and the new watchOS 7.  I also compare features between models in case you’re tryi...

this book contains PUBG. It is about the basic rules of PUBG. It is a guide about the weapons & vehicles in PUBG. Enjoy!

This book presents computer programming as a key method for solving mathematical problems. There are two versions of the book, one for MATLAB and one ...

¿Sabías que con tu iPhone tienes muchas maneras de ganar dinero al mes? Aquí te proponemos 10 aplicaciones que te ayudarán a conseguir unos ingres...

MacBook Air Essentials provides everything you need to quickly set up and start using your new MacBook Air. Learn about the hardware and included apps...

The Develop in Swift Explorations course is designed to help students learn key computing concepts and build a solid foundation in programming with Sw...

Whether you already have a new iPad in hand, are anxiously awaiting its arrival at your doorstep, or are considering purchasing Apple's latest tablet,...

This Teacher Guide provides tools to deepen engagement with aspiring app developers, whether you have experience teaching with Swift or other programm...

Cloud operates at the soft layer & its consumed via internet which makes it have a direct impact on any implications to software & Internet. T...

Problem Solving in C and Python: Programming Exercises and Solutions Part 1 Authors: Yana Kortsarts, Yulia Kempner, Leonid Kugel, Adam Fischbach (Edit...

Retro computers today. A modern view on retro-computing. Software reviews, people behind today's scene, active shops directory, cross development, har...

Fast täglich kann man den Medien Berichte über erfolgreiche Hacker-Angriffe entnehmen. Will man sich nicht in die Reihe der renommierten Opfer einre...

Debian is an open source Linux-based operating system, competing with products such as Red Hat and Caldera. This text provides a guide to installation...

Become fast and productive in Microsoft Word. Microsoft Word 2016 came to make work easy for operators who are into word processing, while its keyboar...

Mac OS X user guide for Myanmar !!! 35 Chapters 228 pages with burmese language.  The Most Useful Mac Os X user guide For Myanmar. This Book incl...

En este práctico manual en formato digital encontrará todo lo que necesita saber acerca del iPhone. Conozca su iPhone, descubra las extraordinarias ...

Your Guide: Evernote for Beginners All You Ever Wanted to Know about The Amazing Evernote App With Evernote Unleashed, you will learn everything you n...

This is all we know on the Apple Silicon M2 and the new Macbook Air.

Have you bought a Raspberry Pi and don't know what to do with it? This simple book of 10 engaging projects aimed at Key Stage 2 and 3 pupils will get ...

MacBook Essentials provides all the information you need to set up and start using your new MacBook. Learn about the hardware and included apps, plus ...

Here’s everything you need to know about Keynote for iPad, straight from Apple. This definitive guide helps you create and deliver polished presenta...

Here’s everything you need to know about Apple TV, straight from Apple. This definitive guide helps you get started using Apple TV and discover all ...

Many textbooks spend a considerable amount of time teaching students the ins and outs of a programming language with very little time on the pitfalls ...

Here’s everything you need to know about iPad, straight from Apple. This definitive guide helps you get started using iPad and discover all the amaz...

Are You Ready To Learn C? C Programming Language introduces you to the most commonly used programming language, one that has been the basis for many o...

Have you ever wondered what ingredients are required to create a compelling presentation? Are you concerned about the amount of personal information t...

Now you can easily download your favorite Wikibooks onto your iPad!  C Programming is a free book produced by Wikibooks and posted free for use u...

Here's everything you need to know about iPad, in a handy digital format. Get to know iPad and discover all the amazing things it can do, and how ...

This book explains not just how to use your Android smartphone or tablet, but what Android is and the roles played by the different parts of the Andro...

Here’s everything you need to know about Apple TV, straight from Apple. This definitive guide helps you get started using Apple TV and discover all ...

⭐BONUS: 2 NFT ONLINE COURSES INCLUDED Do you want to discover the metaverses and how to make money with them? Are you afraid of missing another mega...

Here’s everything you need to know about Numbers for iPhone, straight from Apple. This definitive guide helps you create organized spreadsheets usin...

A lay persons guide into the messy world of software creation. This provides a basic foundation of what software is and the basic forces in it develop...

Discover how great apps on iPad and iPhone are transforming the way businesses work. Explore the breadth of apps available for business with helpful v...

iMac Essentials provides everything you need to set up and start using your new iMac. Learn how to use your mouse and keyboard, set up and use iCloud ...

Here’s everything you need to know about Apple Watch and the Apple Watch app on iPhone, straight from Apple. This definitive guide helps you get sta...

Este manual creado por Apple incluye todo lo que necesitas saber sobre el Apple Watch y la app Apple Watch para el iPhone, y te ayudará a empezar a u...

You do not need a degree of any type to understand computer science, nor do you need any mathematical skills greater than multiplying and dividing num...

Second in the iPad at Work series. iPad transforms the way you work. Learn about how iPad features and apps allow you to streamline common daily busin...

This book presents computer programming as a key method for solving mathematical problems. There are two versions of the book, one for MATLAB and one ...

Here’s everything you need to know about Pages for iPhone, straight from Apple. This definitive guide helps you create beautiful documents and inter...

Here's everything you need to know about HomePod mini and HomePod, straight from Apple. This definitive guide helps you get started with HomePod a...

Here’s everything you need to know about Numbers for Mac, straight from Apple. This definitive guide helps you create organized spreadsheets using t...

Here’s everything you need to know about Apple TV, straight from Apple. This definitive guide helps you get started using Apple TV and discover all ...

This book provides a gentle introduction to programming using  the python programming language.

Here’s everything you need to know about Apple Watch and the Apple Watch app on iPhone, straight from Apple. This definitive guide helps you get sta...

Here’s everything you need to know about Apple Watch and the Apple Watch app on iPhone. Use this guide to learn about all the amazing things Apple W...

Here’s everything you need to know about Pages for iPad, straight from Apple. This definitive guide helps you create beautiful documents and interac...

This tool provides an overview of Tripwire's mission to connect security to the business.

Here’s everything you need to know about Keynote for iPhone, straight from Apple. This definitive guide helps you create and deliver polished presen...

Here’s everything you need to know about iPhone, straight from Apple. This definitive guide helps you get started using iPhone with iOS 15 and disco...

Because there is so much of a buzz around the R programming language in the data science and analytics world, in health-care and other domains, I wrot...

This fully updated study guide covers every topic on the current version of the CompTIA Security+ exam Get complete coverage of all objectives include...

When you hear Apple TV you immediately think it is an actual TV that you are purchasing. But this is not the case. The Apple TV is actually a device t...

From the former news policy lead at Google, an “informative and often harrowing wake-up call” ( Publishers Weekly ) that explains the high-stakes ...

*** Version 5: updated for macOS Big Sur *** macOS Catalina changes the default shell from bash to zsh. zsh will succeed bash as the default shell. ba...

NOTE:   The name of the exam has changed from IT Fundamentals to IT Fundamentals+ (ITF+). However, the FC0-U61 exam objectives are exactly the sa...

“If you happen to be a fan of apple, then you might want to consider getting another look at their product list to see which one would be able to ca...

A compact and accessible history, from punch cards and calculators to UNIVAC and ENIAC, the personal computer, Silicon Valley, and the Internet. The h...

1.Want to start Today to be professionally experienced QA Tester without any experience? 2.Looking for the new job of your dream? 3.Still waiting for ...

Unleash the power of iPhone 13 and iPhone 13 Pro Another year, another iPhone, another opportunity to make your life even easier! As is the case every...

This practical guide will teach you how deep learning (DL) can be used to solve complex real-world problems. Key Features Explore deep reinforcement l...

Get up and running with ReactJS by developing five cutting-edge and responsive projects About This Book • Create pragmatic real-world applications w...

The A to Z guide to getting the most from your Macbook Pro, IPad Pro 2021 And IPhone 12, 12 Pro And Pro Max 3 Books Inside… Book 1- the complete Ste...

If you are looking to learn how to invest in Metaverses without programming knowledge and earn from it, keep reading. I guess you are confused by the ...

We all like to think we're pretty savvy when it comes to using our Macs, and in the case of the typical Macworld reader, that's usually true. But ther...

Grasp the fundamentals of Artificial Intelligence and build your own intelligent systems with ease Key Features Enter the world of AI with the help of...

You've Just Discovered The Perfect Guide To Help You Ace Your CompTIA A+ Core 1 220-1001 & Core 220-1002 Exams! Having the right certification in ...

• Combines engineering graphics with SOLIDWORKS 2019 instruction  • Uses a tutorial style with step-by-step instructions  • Contains n...

*** Learn the basics of VBA in less than one day *** This e-book is an introductory course to Visual Basic for Applications (VBA), an incredibly usefu...

The Wireshark Field Guide provides hackers, pen testers, and network administrators with practical guidance on capturing and interactively browsing co...

Only a few books stand as landmarks in social and scientific upheaval. Norbert Wiener's classic is one in that small company. Founder of the science o...

Use this guide book in its fully updated second edition to study for the ITIL 4 Foundation certification exam. Know the latest ITIL framework and DevO...

Learn steps and tasks to help a NetSuite administrator perform both his daily and monthly tasks efficiently. Advance his expertise to become NetSuite ...

Fully updated to cover the 2019 exam release!   CompTIA's A+ certification is an essential certification to building a successful IT career. Test...

The bestselling cyberpunk author “has produced by far the most stylish report from the computer outlaw culture since Steven Levy’s Hackers ” ( P...

A new edition of the classic primer in the psychology of computation, with a new introduction, a new epilogue, and extensive notes added to the origin...

Will machines someday replace attorneys, physicians, computer programmers, and world leaders? What about composers, painters, and novelists? Will tomo...

To complement the CompTIA Network+ Study Guide: Exam N10-007 , 4e, and the CompTIA Network+ Deluxe Study Guide: Exam N10-007 , 4e, look at CompTIA Net...

This vintage book contains Alexander D’Agapeyeff’s famous 1939 work, “Codes and Ciphers - A History of Cryptography”. Cryptography is the empl...

Are you tired of your Python code turning out wrong? Are you forever finding it difficult to read your code, to spot where the problems are because it...

Step-by-step exam guide to learn Microsoft Azure Administration with hands-on labs. KEY FEATURES Well-organized and detailed coverage for passing the ...

The S22 is featured packed! Great! But how do you actually use the features? This book isn't going to tell you how to do everything—it's going to te...

Learn how to use the 2022 iPhone SE! Do you feel like there's a lot on your phone that you don't know how to work? This book is going to help you out....

If you are worried about setting up the Roku, worry not. This user guide will help you get through all the technical, yet uncomplicated steps to set u...

Smart Objects enable you to work in Photoshop more efficiently and with greater flexibility. This in-depth guide will show you how to get the most out...

This book is designed for anyone who learns how to get started with MicroPython development for Raspberry Pi Pico. The book covers Raspberry Pi Pico w...

"What does AI mean for your business? Read this book to find out." -- Hal Varian, Chief Economist, Google Artificial intelligence does the seemingly i...

Build and mature a threat hunting team capable of repeatably stalking and trapping advanced adversaries in the darkest parts of an enterprise Key Feat...

After many speculations and wild guesses, the iPhone 11, which is the newest entry to the Apple iPhone family, is officially available. HURRAY! The de...

Are you new to iMovie on the iPad? Are you looking for a tutorial or guide to help you learn to edit movies on the iPad? We can help with tutor for iM...

Discover practical techniques to build cloud-native apps that are scalable, reliable, and always available. Key Features Build well-designed and secur...

The only official study guide for the new CCSP exam (ISC)2 CCSP Certified Cloud Security Professional Official Study Guide is your ultimate resource f...

Metaverso es un acrónimo compuesto por meta, un término griego que significa "más allá" y verso que hace referencia a "universo", por lo cual sign...

Get started with the 2022 iPad Air! If someone had told you years ago that one day you could have a device nearly as thin as a piece of paper that is ...

This practical guide to modern encryption breaks down the fundamental mathematical concepts at the heart of cryptography without shying away from meat...

The  #1 selling Wi-Fi networking reference guide in the world   The  CWNA: Certified Wireless Network Administrator Study Guide  i...

Waze is an application that is a GPS based navigational software that was made for smartphone and tablets. It was made to provide turn by turn informa...

Learning a new computer language can be daunting. With Swift, Apple has lowered the barrier to entry  to writing iOS and OS X apps by giving deve...

Get Started With the Apple Watch Series 7 / SE and watchOS 8 The Apple Watch is hard to define. It's a great device to…make calls...send messages......

We're in the midst of an AI research explosion. Deep learning has unlocked superhuman perception to power our push toward creating self-driving vehicl...

A Comprehensive Guide to Mastering Your 2020 iPad 10.2” (8th Generation) and iPadOS 14. Apple unveiled on Tuesday, Sept. 15, 2020 its latest iterati...

"The computer world is like an intellectual Wild West, in which you can shoot anyone you wish with your ideas, if you're willing to risk the consequen...

This fully updated study guide delivers 100% coverage of every topic on the CompTIA ITF+ IT Fundamentals exam Take the CompTIA ITF+ IT Fundamentals ex...

Get started in the rapidly expanding field of computer vision with this practical guide. Written by Adrian Kaehler and Gary Bradski, creator of the op...

This book will save your time of search and get help.It contains all windows command prompt commands. Command Prompt is a command line interprete...

★★★ Learn how to use Apple Watch ★★★ WatchOS 7 is perhaps the biggest WatchOS update to date. While the UI looks similar to othe...

Updated 2020. With massive 12.9-inch and 11-inch displays, blazing performance and support for both Apple Pencil and the Smart Folio Keyboard, the iPa...

Bestselling author Bruce Schneier offers his expert guidance on achieving security on a network Internationally recognized computer security expert Br...

An urgently needed examination of the current cyber revolution that draws on case studies to develop conceptual frameworks for understanding its effec...

Get Into UX book is a career advice book written to help new and experienced designers get unstuck in their pursuits to get UX jobs. The UX field has ...

Manage your data with a system designed to support modern application development. Updated for MongoDB 4.2, the third edition of this authoritative an...

It’s a bargain! The definitive guide to buying and selling success on eBay - fully updated for 2020 Want to know the best way to get rid of some of ...

The most up-to-date, in-depth guide for TCP/IP mastery TCP/IP is the ultimate guide to the glue that holds the Internet together. When two computers �...

The bestselling PC reference on the planet—now available in its 13th edition Completely updated to cover the latest technology and software, the 13t...

★★★  Unleash the power of iPad Pro  ★★★ When the iPad was released nearly 10 years ago, it was hard to imagine that a thin table...

If you are a JavaScript developer or someone who has basic knowledge of JavaScript, and want to explore its optimum ability, this fast-paced book is d...

"Views differ on bitcoin, but few doubt the transformative potential of Blockchain technology. The Truth Machine is the best book so far on what has h...

In this new fifth edition, Michael Linenberger updates his longtime #1 bestselling Outlook book to include Microsoft's new Outlook version 365 (Window...

Starting with its humble beginnings in the 1950's and ending with its swan-song, the Dreamcast, in the early 2000’s, this is the complete history of...

Machine learning systems are both complex and unique. Complex because they consist of many different components and involve many different stakeholder...

A comprehensive guide to programming with network sockets, implementing Internet protocols, designing IoT devices, and much more with C Key Features L...

Tracy Kidder's "riveting" ( Washington Post ) story of one company's efforts to bring a new microcomputer to market won both the Pulitzer Prize and th...

ITIL ® Foundation Essentials ITIL 4 Edition is the ultimate revision guide for candidates preparing for the ITIL 4 Foundation exam. It is fully align...

Like the best-selling Black Hat Python , Black Hat Go explores the darker side of the popular Go programming language. This collection of short script...

This bestselling on-the-job reference and test preparation guide has been fully revised for the new 2019 CompTIA A+ exam objectives This fully revised...

Learn how to use the iPhone 13! Remember when phones actually called people? They still do that, obviously, but they do so much more today! They keep ...

Develop sophisticated mapping applications from scratch using Python 3 tools for geospatial development About This Book • Build web applications bas...

“Thinking twice about our use of digital media, what our practices are doing to us, and what we are doing to each other, is one of the most importan...

SALIENT FEATURES OF BOOK  • Easy to understand language with simple real life examples. • Primarily focused on Ecommerce and Retail industry....

This is the eBook version of the printed book. Every day, billions of photographs, news stories, songs, X-rays, TV shows, phone calls, and emails are ...

A Turing Award-winning computer scientist and statistician shows how understanding causality has revolutionized science and will revolutionize artific...

Pointing to the triumph of artificial intelligence over unaided humans in everything from games such as chess and Go to vital tasks such as protein fo...

★☆ Have you come across the terms machine learning and neural networks in most articles you have recently read? Do you also want to learn how to b...

The iPhone XR is the number 12 in what is now a long line of iPhones produced by Apple. There are many expectations that iPhone users all over the wor...

Thoroughly revised for the new CompTIA Network+ exam, the Seventh Edition of this bestselling All-in-One Exam Guide delivers 100% coverage of the exam...

As heard on NPR's "Science Friday," discover the book recommended by Malcolm Gladwell, Susan Cain, Daniel Pink, and Adam Grant: an "accessible, i...

Learn how to drive the coolest laptop on the planet You took the plunge, paid extra, and—even though it looks and feels like perfection—have that ...

The Complete, Definitive Guide to your iPad Pro 2021 5th generation And IPhone 12, pro & Pro Max   Part 1-: iPad Pro 2021 (5th Generatio...

The brilliant writing app Scrivener is finally on iPads but the great Ulysses got there first. Each is a boon for writers and publishers, each lets yo...

Improve Your Creativity, Effectiveness, and Ultimately, Your Code In Modern Software Engineering, continuous delivery pioneer David Farley helps softw...

If you’ve used any computer, then a Chromebook will be easy enough to use as soon as you open it up for the first time. If you really want to take a...

The Apple Watch Series 7 is an awesome watch that is great for many things; make calls, send messages, fitness, health.. you get the idea. It has a lo...

The Complete User Guide to Apple watchOS 7 watchOS 7 offers updates to faces for more personalization and faster access to your favorite apps. The ult...

Go from beginner to builder quickly with this hands-on JavaScript guide Coding with JavaScript For Dummies provides easy, hands-on instruction for any...

This highly effective self-study system offers complete coverage of every subject on the aPHR® exam Take the Human Resources Certification Institute�...

With this book in your hands, you will have a lot more grasp of how the iPhone Pro Max can serve you better and makes you a proud senior who is able t...

Learn how to create your next blockbuster on your Mac with our video tutorial Tutor for iMovie. Tutor for iMovie includes video lessons on creating pr...

In Self-Sovereign Identity: Decentralized digital identity and verifiable credentials , you’ll learn how SSI empowers us to receive digitally-signed...

The second edition of a comprehensive introduction to machine learning approaches used in predictive data analytics, covering both theory and practice...

Get the Tips and Tricks of the Latest Apple iPhone Device (iPhone 13) with this User Guide Now! The new iPhone 13 and iPhone 13 mini recently int...

This seminal book injects the topic of superintelligence into the academic and popular mainstream. What happens when machines surpass humans in genera...