Non-verbal languages

Non-verbal languages are very important especially at the place you cannot speak a particular language. so why not the whole world teach/learn non-verbal languages?

you mean sign language?

yes

fair question, but is international sign language standardised, or does it vary in different places?

http://en.wikipedia.org/wiki/Tower_of_Babel

hiya
I did a course on spanish sign language.  it is very different to english.  I thought it was international before doing it.  Also there are differences as to the area in which you live in spain - as there is in the actual spoken language.
I prefer body language myself......!