Why are cactuses prickly?
https://mgln.ai/e/5/dts.podtrac.com/redirect.mp3/chrt.fm/track/3G835/play.publicradio.org/podcast/o/americanpublicmedia/podcasts/moment_of_um/episodes/2022/05/09/momentofum_20220509_078_128.mp3
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