Found by way of Phil Plait (of Bad Astronomy blog fame), scientists work out when and why impact craters form rays after watching YouTube videos of grade school level science class experiments (dropping rocks in trays of flour to model impact craters) and noticing a difference between when the teachers did the experiment and the students did: https://www.syfy.com/syfywire/why-do-some-impact-craters-have-rays
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