Find out Susie & Sarah's highs & lows from 2019. Sarah shares some of science's biggest developments last year. We find out why they might be building a "hen den" on the moon (or not). Susie gets crabby about the Kardsashians. Sarah tells us about a Human Library where you check out people, not books. We find out why being in Antarctica will change your brain. Plus, we learn the history of denim, & why some people mine for jeans underground.

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