There are about 6,500 languages all over the world. But about half of them are in danger of disappearing. One organisation called Wikitongues is trying its best to save world languages. It has a simple goal: to provide tools and support for people who need to save their languages. Wikitongues has an open collection of world languages online. The collection is in the form of language videos. Now, there are over 400 languages on Wikitongues. ... When a language disappears, many other things like culture and knowledge can disappear too. So, it's necessary to bring languages back. There are many languages that disappeared but later returned to use. Hebrew disappeared in the 4th century BC, and people brought it back in the 1800s. Now once again, it's the mother language of half of the world's Jewish population. ...