Next Slideshow Title
IMAGES PROVIDED BY:
(1) Getty Images
(3) Getty Images
(4) Getty Images
(6) Getty Images
(7) Getty Images
(9) Getty Images
(11) Getty Images
Nemours: “Your Digestive System.”
International Hyperhidrosis Society: “Understanding Sweat.”
Arizona State University School of Life Sciences: “The Nose Knows.”
Association for the Advancement of Wound Care: “The Skin You’re In Fun Facts.”
The Library of Congress.
Smithsonian National Museum of History: “Young or Old?”
Smithsonian National Museum of History: “Male or Female?”
Stevens, J. MIT Technology Review , published online Jan. 1, 1997.
Sexual Medicine Society of North America, Inc.
Nemours: “Male Reproductive System.”
American Society for Reproductive Medicine: “Sperm Morphology (Shape): Does it Affect Fertility?”
News Release: North Carolina State University.
Your Wild Life: “Belly Button Biodiversity.”
Ghorayshi, A. Wired , published online Nov. 10, 2014.
McDonald, J. Myths of Human Genetics , Sparky House Publishing, 2011.
Reviewed by Melinda Ratini, DO, MS on February 28, 2019
This tool does not provide medical advice. See additional information.
THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.
View our slideshows to learn more about your health.