Did ancient cave artists share a global language?

The same 32 symbols show up in prehistoric European cave art.

Photo credit: PIERRE ANDRIEU / AFP / Getty Images
  • Many of these symbols are found in caves in Africa, Asia, Australia and America as well.
  • At least 40,000 years old, the set of symbols may have been a universal communications tool.
  • Among these symbols is the iconic hashtag.
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