Let me tell you my pet peeve with mermaids and the movies. No matter what kind of production it is, big or small budget, bit player or star, Hollywood always makes the same mistake. Maybe it’s just ignorance or a limited special effects budget. Probably a bit of both. So let me take the opportunity to enlighten you. Mermaids don’t have knees. If anything, a mermaid’s spine is closer to a dolphin’s. It tapers into a tail with lots of vertebra. There’s no joint that lets them tuck their knees in. If you asked a mermaid to lift her tail, it would curl up like a snake. Right But you…