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The following scientific events occurred in 2023. Events January February March April 3 April Five employees at the National Hurricane Center publish a tropical cyclone report (TCR) on Hurricane Ian, which officially upgrades the hurricane from a Category 4 to a Category 5 on the Saffir–Simpson scale. The TCR also stated that Hurricane Ian caused, with 90% confidence, $112.9 billion worth of damage to the United States, which made Ian the third-costliest United States hurricane on record as well as the costliest hurricane to strike Florida on record. An unexplained rise of emissions of five chlorofluorocarbons (CFCs), successfully banned by the Montreal Protocol of 1989, is reported. Their climate impact in 2020 is roughly equivalent to that of the CO2e from Denmark in 2018. A study affirms and explains why a moderate decrease in body temperature extends lifespan. 5 April The NOAA reports that greenhouse gases continued to increase rapidly in 2022 and that CO2 levels in the atmosphere are now the highest in 4.3 million years. An umbrella review summarizes scientific results on the extensive health effects of added-sugar foods and makes recommendations such as limiting sugar-sweetened beverages which are "the largest source of added sugars" and developing of policy such as advertising restrictions. 6 April – A study shows neurons take up glucose (from food) and metabolize it by glycolysis. There was only limited research on how neurons get their energy in the context of links between glucose metabolism and cognition (brain health and performance). 10 April – A study expands upon the role of elites' unsustainable consumption in urban water crises. In Cape Town, for example, the wealthiest 14% of the population use half of the city's water, while the poorest 62% use just a quarter. 11 April – A study reports that genomic surveillance (GS) shows that a clonal lineage of the wheat blast fungus has spread worldwide and that there is a need for GS to track and mitigate the potential pandemic threat to the global food supply as it may become fungicide-insensitive. 13 April The direct imaging of HIP 99770 b, a new exoplanet found 133 light years away, is reported by astronomers. A global trend towards more rapid-onset "flash droughts" hindering forecasting is reported. 14 April Jupiter Icy Moons Explorer (JUICE) is launched by the European Space Agency (ESA) to search for life in the Jovian system, with an expected arrival date of 2031. 17 April A new technique for improving the resolution of post-mortem MRI brain scans "by 64 million times" is reported by researchers, who capture the sharpest ever images of an entire mouse brain. A study expands upon the international Earth heat inventory from 2020, which provides a measure of the Earth energy imbalance (EEI) and allows for quantifying how much and where heat has accumulated in the Earth system with comprehensive data. It suggests that the EEI is the "most fundamental global climate indicator" to gauge climate change mitigation efforts. 18 April Astronomers conclude that "... planets in the habitable zones of stars with low metallicity are the best targets to search for complex life on land." A university reports a study (29 Mar) affirming the high level of economic losses from biological invasions, showing they have risen to the level of economic damage costs from floods or earthquakes, which are also rising. 19 April A bolide is observed over Ukraine and Belarus for about five seconds. It is first observed at an altitude of 98 km above Velyka Dymerka, then passes directly above Kyiv at an altitude of 80 km and continues to the southwest with a speed of 29 km/s. A bright flare occurs at an altitude of 38 km, when the bolide's absolute magnitude reaches approximately −18. The likely cause of grey hair is shown to be pigment-making cells losing their ability to mature into melanocytes. Researchers show parrots can and enjoy to use a videocalling system. A study with mice shows that microplastics pass the blood–brain barrier (BBB), entering and accumulating in the brain, and identifies a key determinant for whether or not they pass the BBB. 20 April A new 29-year record of ice sheet mass in Greenland and Antarctica is published as part of the IMBIE collaboration. It finds that the combined ice loss in these regions has more than tripled since the early 1990s, with 2019 seeing the greatest losses of any year on record. These findings have implications for future sea level rise. Paleoneurologists publish the first neuroevolutionary timeline about correlations of changes in the shape of the cerebral cortex and functions, showing "variability in surface geometry relates to species' ecology and behaviour" and cognition. It characterizes many of the neuromorphological events in the origin of distinct human intelligence over the past 77 million years. A UNICEF report indicates "public perception of the importance of vaccines for children declined during the COVID-19 pandemic in 52 out of 55 countries studied" with causal factors including "growing access to misleading information". On 26 April, news outlets report that Twitter is warned by EU digital policy-makers after a report indicated its recent policies "boost" Russian disinformation-based propaganda. On 17 April, Twitter introduces labels for rationales when tweets are made less visible which previously were semi-censored without any explanation. On 5 April, the first review of interventions against false conspiracy beliefs, with interventions "that fostered an analytical mindset or taught critical thinking skills" being most effective and preventive action being important. 21 April – Researchers report the development of neuromorphic AI hardware using nanowires (see also 2020-04-20) physically mimicking the brain's activity in identifying and remembering an image from memory. On 26 April, a university reports on a demonstration (11 Mar) of multisensory motion cue integration by a neuromorphic nerve for robots. 24 April Astronomers release close-up global images, for the first time, of the Martian moon Deimos that were taken by the Mars Hope orbiter. The first review of issues identified in meta-science of metascience is published, providing an overview of ten "questionable" practices (QMPs) in the field such as "overplaying the role of replication in science" and preregistration potential. A policy study identifies reduction of car travel activity as the most important transportation policy option in reducing GHG emissions to levels comparable to carbon budget levels, with a "decrease car distance driven and car ownership by over 80% as compared to current levels" by 2027 being effective in "edging close to the designated carbon budget" in their case-study of London and electrification being highly insufficient. On 20 April, an international study indicates that the contemporary domestic policy-proposal of a general speed limit on highways in Germany, the only large.... Discover the Erica Reischer popular books. Find the top 100 most popular Erica Reischer books.