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Scientists believe they have discovered the cause of the megalodon's extinction – and no, it’s not Jason Statham. Experts have been conducting research on fossils of teeth from the biggest species of shark the world has ever seen, which went extinct around 3.6 million years ago and measured at least 15 metres long. Research published in the journal Proceedings of the National Academy of Sciences explains that the animal was actually partially warm-blooded. Unlike most cold-blood sharks, the body temperature is thought to have been around 27 degrees. The temperature is higher than the sea temperatures around the time. Sign up to our free Indy100 weekly newsletter Study co author Robert Eagle, who is professor of marine science and geobiology at UCLA, said [via CNN]: “We found that O. megalodon had body temperatures significantly elevated compared to other sharks, consistent with it having a degree of internal heat production as modern warm-blooded (endothermic) animals do.” They were able to prove that the animals were warm-blooded by analysing how carbon-13 and oxygen-18 isotopes were closely bonded together in the fossilised teeth. Senior study author Kenshu Shimada is a paleobiologist at DePaul University in Chicago, who said: “A large body promotes efficiency in prey capture with wider spatial coverage, but it requires a lot of energy to maintain. “We know that Megalodon had gigantic cutting teeth used for feeding on marine mammals, such as cetaceans and pinnipeds, based on the fossil record. The new study is consistent with the idea that the evolution of warm-bloodedness was a gateway for the gigantism in Megalodon to keep up with the high metabolic demand.” The fact it was warm-blooded means that regulating body temperature could have been the cause of its eventual demise. The Earth was cooling when the animal went extinct, which could have been a critical factor. “The fact that Megalodon disappeared suggests the likely vulnerability of being warm-blooded because warm-bloodedness requires constant food intake to sustain high metabolism,” Shimada said. “Possibly, there was a shift in the marine ecosystem due to the climatic cooling,” causing the sea level to drop, altering the habitats of the populations of the types of food megalodon fed on such as marine mammals and leading to its extinction. “One of the big implications for this work is that it highlights the vulnerability of large apex predators, such the modern great white shark, to climate change given similarities in their biology with megalodon,” said lead study author Michael Griffiths, professor of environmental science, geochemist and paleoclimatologist at William Paterson University. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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Senate minority leader Mitch McConnell reportedly tripped and fell while disembarking from a plane earlier this month before he abruptly froze mid-sentence during a news conference on Wednesday, according to reports. Mr McConnell fell from a plane at Ronald Reagan Washington National Airport on 14 July after the flight was cancelled and everyone had boarded the plane, two sources told NBC News. The 81-year-old has recently started using a wheelchair as a precaution while travelling in crowded places such as airports, a source said. A passenger who was in the same plane as Mr McConnel said he had a “face plant” and another passenger helped the Republican leader, according to the report. On Wednesday, he abruptly stopped while speaking during the weekly Republican leadership press conference and had to be led away by colleagues. The Kentucky senator stared vacantly for around 20 seconds before his colleagues who were standing behind him asked him if he wanted to return to his office. He did not respond but slowly walked back. He returned later to the conference and said he is “fine” and answered questions from the press. “The president called to check on me. I told him I got sandbagged,” he joked, in an apparent reference to a quote from Joe Biden in June he made after he tripped over a sandbag and fell while onstage at the US Air Force Academy graduation. A polio survivor as a child, Mr McConnel has long acknowledged some difficulty as an adult in climbing stairs. Mr McConnel was out of the Senate for almost six weeks after he sustained a concussion and fractured a rib when he fell and hit his head after a dinner event at a hotel earlier this year. He was hospitalised for several days. In 2019, he also tripped and fell at his home in Kentucky, causing a fracture in his shoulder and required surgery. “He’s definitely slower with his gait,” a Republican senator was quoted saying by NBC. They added that “he doesn’t address” his health issues even during closed-door meetings with GOP leaders. Read More Mitch McConnell leaves press conference abruptly after appearing unable to speak Trump news – live: Trump begs Congress to help save him from legal troubles as Jan 6 indictment decision looms North Korean leader Kim Jong Un meets with Russian defense minister on military cooperation Trump wants to see Biden impeached, and other Republicans are quick to pile on Mitch McConnell’s health history reveals previous issues after briefing freeze Mitch McConnell leaves press conference abruptly after appearing unable to speak

The battery-powdered purr machines are part of the library's collection of unusual items available for lending.