Apparently, some elephants are as intelligent as an eight-year-old child. This and other sometimes-depressing, sometimes-inspiring facts are in the latest hilarious Casually Explained video on the spectrum of intelligence.

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It covers the range of “little robots” that respond to stimuli all the way up to people (not any of us, sadly) who can rewrite any song after only hearing it once.

There’s also a nice little segue on the narrator’s ex-girlfriend and it, uh, doesn’t sound like it ended well.