Dr Karl and Dr Helen - talking about .World's longest echo, how to photograph the molecules inside an explosion, Oceans, Coffee rings and climate change. Physics today is "messy" and "complex" and she loves it. (from 2017)

What is Real ?  (91)

Dr Karl's a curious optimist – a great combination for a science lover. Join him and his guests for weird facts, amazing conversation and remember, it's never too late for a happy childhood. 
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