Everything you always wanted to know about humans, but were afraid to ask ...
- Seventy percent of the dust in your home consists of shed human skin and hair.
- One human hair can support 3 kg.
- The average human scalp has 100,000 hairs.
- Each square centimetre of human skin on the hand contains about 100 cm of blood vessels and 300 cm of nerve tissue.
- The tooth is the only part of the human body that can't repair itself.
- Every human spent about half an hour as a single cell.
- One human brain generates more electrical impulses in a single day than all of the world's telephones.
- The average human being will walk 160 billion millimetres in a lifetime.
- Human thighbones are stronger than concrete.
- Most tropical marine fish could survive in a tank of human blood.
- It takes the interaction of 72 different muscles to produce human speech.
- If you gave every human on earth an equal portion of dry land (including uninhabitable areas), everyone would get a plot of land roughly 150 metres by 150 metres.
- Humans are the only animals that cry tears and blush.
- The grain and soybeans fed to U.S. livestock could feed 1,300,000,000 humans.
- If all the molecules of DNA in a single human cell were laid out end to end, they would stretch 2 metres. This DNA is packed into a nucleus 10 millionths of a metre across.
- Frowning uses more muscles in the face than smiling does.
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