• The first known examples of identifying oneself by “biometric” characteristics are cave handprints, the oldest of which was discovered in Cáceres, Spain. Using the uranium-thorium method, it was dated to more than 64,000 years old and was made by a Neanderthal.
  • In a cave estimated to be at least 31,000 years old, numerous handprints surround the artistic paintings created by the prehistoric people who lived there. It is thought that these handprints acted as the signature of their artists.
  • Early Egyptians identified the reputations of traders they knew by physical descriptions versus those new to the market.