what kind of lasers are these ? whY can you see them in the air ? but not laser pointers ?

http://www.youtube.com/watch?v=eXHurkYJglE&playnext_from=TL&videos=P8_vWyqCooM

see they have green lasers that you can see in the air, but the air is not full of smoke,or water particles, so how come you can see these green lasers in the air but not laser pointers ? and why don’t they blind people in the audience ?

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