How many languages have ever existed ever?

Question: How many languages have ever existed ever?
- Keywords:
  human,
  language,
  world
Asked by isabelle o froggatt on 16 Jun 2015.
- anon answered on 16 Jun 2015:
  
  There are about 6500 languages in the world. However, this changes constantly, new languages develop and others die out. At the moment, about 2000 languages are in danger as they are only spoken by very few people. Do you speak any foreign languages?

Question: How many languages have ever existed ever?