What happened to the giant bugs?

Once upon a time (around 300 million years ago), Earth was home to massive dragonfly-like insects and two meter long millipede-like creatures. Why did they die off?

Guests: Ned Snelling (up.ac.za/research-matters/researcher/edward-sn…), professor of experimental physiology at the University of Pretoria; Jon Harrison (search.asu.edu/profile/43633), professor of environmental physiology at Arizona State University

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