What was the first word on earth

Question: What was the first word on earth
- Keywords:
  history,
  language,
  word
Asked by alan14211421 to Alessandro, Angela, Claudia, Marina, Phil on 16 Mar 2013.
- Marina De Vos answered on 16 Mar 2013:
  
  Nobody knows. Words are created by societies out a sounds. So different societies have different words. Some years ago, research succeeded in making a group of robots develop their own language.

Question: What was the first word on earth