• Intelligent people have more zinc and copper in their hair
  • Humans are the only animals to sleep on their backs
  • Your stomach has to produce a new layer of mucus every two weeks or it will digest itself
  • Perfume is frequently made from - among other things- a slippery, musky substance called Ambergris which is vomited up by certain species of whales from time to time
  • Our eyes are always the same size from birth, but our nose and ears never stop growing