Heinlein wrote in Stranger in a Strange Land that "Man is the [only] animal who laughs." Who's laughing now? (Rats and cows apparently). All jokes aside, inter

Heinlein wrote in Stranger in a Strange Land that "Man is the [only] animal who laughs." Who's laughing now? (Rats and cows apparently). All jokes aside, interesting research. We find ourselves more similar than dissimilar to our less sentient counterparts each year.