The catastrophic Chicxulub asteroid impact 66 million years ago launched enormous quantities of sulfur into the stratosphere, rock chemistry suggests. This sulfur enhanced global cooling that contributed to the dinosaurs’ demise. Image: Kevin M. Gill
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Researchers have discovered a simple and surprising control over the depth of a volcano’s magma chamber: how much water it contains. The finding is significant because water fuels the most devastating eruptions. Image: DANIEL RASMUSSEN/SMITHSONIAN
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Sharks benefit from some shuteye, and biologists in Australia and New Zealand think they’ve begun to understand why. Image: Darren Shilson
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After analysing the teeth and thigh bones of 38 T. rex fossils, some researchers propose reclassifying them as three different species, but others are unconvinced. Image: Erik Schepers
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Winter began in spring for many animals during the final year of the age of dinosaurs. Palaeontologists studying fossilized fish suggest that spring was in full bloom in the Northern Hemisphere when an asteroid slammed into Earth, triggering a devastating global winter and mass extinction. Image: Joschua Knüppe
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