Using the equinox to have my students measure the size of the Earth ala Eratosthenes. Just did it myself and got to within 3% with my paper obelisk! 🔭🧪

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In the decade since the first sighting of gravitational waves, LIGO (working with partners in Europe & Japan) has detected 300 gravitational signals. These are now weekly events. Soon we could map the entire space-time sky--if we continue to explore. 🧪🔭 www.ligo.caltech.edu/news/ligo202...

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A brand-new series of 8 out of 10 Cats does Countdown starts tonight, starring Bob Mortimer (which is probably all you need to know). Hope you enjoy it as much as we did. 9pm on C4.

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‘Despite what the movies tell us, dinosaurs probably didn't roar at their prey. It's more likely that they chirped like birds, based on a well-preserved new fossil with an intact voice box’ www.sciencealert.com/ancient-voic...

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Australian archaeolinguistics academic.oup.com/edited-volum...

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