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Sexual selection, a mechanism of evolution that can drive the appearance of bright feathers and elaborate horns, is more widespread among females than many researchers expected ....
Barry Lewis/Alamy University students tend to get lower grades if their classes and lectures begin early in the morning. Attending classes and sleeping well are both associated with increased engagement and performance at university – but a course with lectures scheduled early in the morning might compromise students’ ability to do both. To investigate, Joshua Gooley at Duke-NUS Medical School in Singapore and his colleagues analysed the grades of 27,281 undergraduates enrolled at the National University of Singapore. The students were attending classes between 2018 and 2020, … Continue reading Subscribe now for unlimited access App + Web ....
John Durban (NOAA) and Holly Fearnbach (SR3), NMFS research permit #17355 Surveillance of right whales in the North Atlantic show that individuals born today will grow to be 1 metre shorter, on average, than whales born in the early 1980s. Joshua Stewart at the National Oceanic and Atmospheric Administration in San Diego, California, and his colleagues have used surveillance data collected from aircraft and drones to investigate how North Atlantic right whales ( Eubalaena glacialis) have changed over time. The whales have been monitored consistently for decades, and researchers can identify individuals and know when each was born. Stewart’s team collected 202 length measurements of 129 of the whales born between 1981 and 2019: 133 measurements were taken from aircraft between 2000 and 2002, and 69 measurements were obtained using remotely operated drones between 2016 and 2019. ....
Sharks living in the open ocean experienced a previously unknown mass extinction event about 19 million years ago that wiped out nearly 90 per cent of the predators ....
Advertisement They filled an aquarium with a certain volume of water and measured how long the elephant spent inhaling water from the tank via its trunk. They then measured the volume of water left in the aquarium after the experiment. The researchers calculated that elephants suck up water with what would be an equivalent air velocity of 150 metres per second. “That is around 30 times the speed of the human sneeze,” says Schulz – when we sneeze, we exhale air with a velocity of 4.5 metres per second. Schulz and his team also estimated the trunk’s capacity by measuring the internal volume of a trunk that came from a 38-year-old African elephant that had been put down because of medical issues. This trunk was a similar size and weight to the trunk of the elephant in the Atlanta zoo. ....