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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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A whistleblower who claims that the US government has been operating UFO retrieval research in secret has reportedly said that UFOs have been responsible for the deaths of humans. David Grusch worked for the National Geospatial-Intelligence Agency (NGA) and the National Reconnaissance Office (NRO) and was involved with the Unidentified Aerial Phenomena Task Force. He claimed that some of the “non-human intelligences” discovered have malevolent intentions and have killed people. Speaking to NewsNation [via the Daily Mail], he also reportedly claimed that the US is in a race with Russia and China to study extraterrestrial life. Sign up to our free Indy100 weekly newsletter “I think the logical fallacy there is because they’re advanced, they’re kind. We’ll never really understand their full intent and that’s because we’re not them. But I think what appears to be malevolent activity has happened.” He added: “That’s based on nuclear site probing activities and witness testimony. Grusch was then asked if UFOs had ever killed humans and he replied: “While I can’t get into the specifics because that would reveal certain US classified operations, I was briefed by a few individuals on the program that there were malevolent events like that.” The 36-year-old also suggested that the US government would go to extreme lengths to keep secrets covered up, saying: “At the very least, I saw substantive evidence that white-collar crime was committed… unfortunately. “I’ve heard some really un-American things I don’t want to repeat right now.” Grusch previously claimed that the US government has a "non-human origin" in-tact craft that they're keeping from the public. Speaking to NewsNation, Grusch said: "These are retrieving non-human origin technical vehicles, call it a spacecraft if you will, non-human exotic origin vehicles that have either landed or crashed." 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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