This week John and Shannon continue talking about Earth’s past climate and snowball Earth, then delve into the physics of cactus.

• Geologic Timescale

Fun Paper Friday

• Which cactus is the worst to get stuck by? Find out in this week’s fun paper!
• Crofts, S. B., and P. S. L. Anderson. “The influence of cactus spine surface structure on puncture performance and anchoring ability is tuned for ecology.” Proceedings. Biological sciences 285.1891 (2018).

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Show - Support us on Patreon! - www.dontpanicgeocast.com - SWUNG Slack - @dontpanicgeo - [email protected]

John Leeman - www.johnrleeman.com - @geo_leeman

Shannon Dulin - @ShannonDulin