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million years ago


The largest arthropod to ever live finally has a head

The largest arthropod to ever live finally has a head

Though the specimens provide a wealth of information about Arthropleura, there’s a lot left to learn about this mighty millipede, including what it might have eaten and whether it walked on land, underwater or was capable of both.


Mega El Niños kicked off the world’s worst mass extinction

Mega El Niños kicked off the world’s worst mass extinction

For instance, today’s El Niño-Southern Oscillation — a periodic warming of the tropical Pacific Ocean that brings heat and aridity to northern North America, dampens the Atlantic hurricane season, and induces droughts and floods globally — lasts roughly a year (SN: 2/13/23).