People will often say they know something "like the back of their hand" to indicate that they're familiar with it top to bottom. But how much do you actually know about your own body?
HowStuffWorks.com has 16 tidbits that will probably both shock and enlighten you. The next time someone says they know something "like the back of their hand" you should probably reply, "Oh really?"
- Tongue Print: Don't stick out your tongue if you want to hide your identity. Similar to fingerprints, everyone also has a unique tongue print!
- Bacteria: This may make your skin crawl: Every square inch of your skin has about 32 million bacteria on it, but fortunately, most of them are harmless.
- Head Weight: No wonder babies have such a hard time holding up their heads: The human head is one-quarter of our total length at birth but only one-eighth of our total length by the time we reach adulthood.