Back in 2001, [Helmar] made an awesome monochrome video display out of a red laser pointer and a spinning ... so [Helmar] decided to go full color with his laser projector.

This question comes from Peter who asks if every person on Earth aimed a laser pointer at the moon at the same time would it change color. The answer is, not if we use regular laser pointers.

However, ironically for him, he is alarmed that many green laser pointers are more powerful than they are supposed to be. Sure, you often want a powerful laser, but if you think a laser is safe ...