The curvature of empty space caused by an entire galaxy has now been pinned down with unprecedented precision, demonstrating Einstein’s theory of general relativity still rules on a super-sized scale. Not that anybody is seriously surprised. But on the off chance the results had failed to meet expectations, they might have provided insight into some
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Shutterstock A new review and analysis of several studies has found that probiotics do not improve self-reported anxiety symptoms in humans, not even a little. The study reviewed 36 preclinical studies in total, 14 involving humans and 22 involving rats and mice. That’s a decent-sized sampling of the research covering a variety of probiotic strains, and it turned
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Almost all the large vertebrates on Earth suddenly went extinct 66 million years ago – including dinosaurs, mosasaurs, plesiosaurs, and pterosaurs. A city-size asteroid or comet is thought to be responsible for that mass extinction. The impact, called the Chicxulub event, triggered global cooling and volcanic eruptions that transformed Earth. In the 1980s, Richard Muller,
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