Butts are funny, but they're also useful! Humans use their butts for two primary functions--sitting and pooping. It's th... MoreBattle of the Butts: The Science Behind Animal Behinds
A Junior Library Guild Gold Standard Selection!Birdbrained. Pigheaded. Batty. Bullheaded. When humans want to insult the... MoreBattle of the Brains: The Science Behind Animal Minds
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