Medical myths even doctors believe

People only use 10 percent of their brains – Nope, we use it all.
Hair and fingernails continue to grow after we die – nope, the body “shrinks” as it dries out.
Eating turkey makes you sleepy – no more so than other meat
People should drink at least eight glasses of water a day – Nope you need 64 ounces of water, but that figure includes tea, coffee and food.