article_snippet.sent: Scientists believe the first complex conversation between humans took place around 50,000 to 100,000 years ago.
article_snippet.sent: Scientists believe the first complex conversation between humans gradually took place around 50,000 to 100,000 years ago.
article_snippet.sent: Earlier this year, researchers argued that cavemen initially began communicating 2.5 to 1.8 million years ago - and researchers were talking about DIY.
highlights_snippet.sent: Complex human conversation began around 50,000 to 100,000 years ago .
  