Ever go looking for your dog's belly button but were hard-pressed to find one? Do dogs even have a belly button? They do indeed. In fact, all mammals except marsupials like kangaroos have one. The ...

I've got a belly button issue. I used to have an "inny," now I have an "outy." My gut has gone from flabby to hard like a melon. What gives? —Navel Cadet As you grow older, your belly button ...

Scientists at the Belly Button Biodiversity Project wanted to engage the public. They started to culture the bacteria in people's navels as a way to remind them about the life living on their ...