In one study, 60 volunteers swabbed their belly buttons. Researchers then analyzed the samples and found more than 2,300 kinds of bacteria. That's an average of 67 different kinds per belly button.

Doctors weigh in on the pros and cons of navel pulling, an ancient practice that's going viral because of claims it helps ...

The team of researchers sequenced small fragments of each microbe’s genome to identify the diversity of microbes in each belly button. Each volunteer harbored an average of 67 different types of ...