Aquatic ape theory. Pro's point out it's odd that humans have salty tears. Human salty tears is a big deal. Anti's say oh no it jolly well isn't. Dozens of animals, including our lose cousin apes ry salty tears, the salty tears argument is garbage. So who is right ?

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that said the fact that humans have salty tears (as do many other mammals as you correctly point out) has very little if no bearing on the veracity of the hypothesis!