X-ray scans of a 305-million-year-old arachnid fossil have unlocked a new chapter in the origin story of spiders. Long before dinosaurs reigned supreme, this ancient eight-legged creature cruised along the Earth. Modern humans would have mistaken it for a spider, but it lacked a crucial talent: the ability to spin webs.

Learn more: http://to.pbs.org/1ZNF6BH

Video/Images by:
Russell Garwood, University of Manchester
Proceedings of the Royal Society B

Additional Video bY:
Getty Images

Audio by:
Pictures of the Floating World

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