This handheld "laser show" uses a piece of string and a motor to create some really cool optical illusions and effects.
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Once costing hundreds of dollars, the high-powered green laser is now an affordable, amazing gizmo that the determined hobbiest can afford. This review covers a 50 milliwatt 532nm green laser from Vavolo.com.
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I don't think that giving presentations in front of crowds would be on anybody's "favorite things to do" list, but there are some tricks you can use to help make it easier. This slick little handheld remote lets you control your computer, flip PowerPoint slides, point things out with a laser, and then stores handily inside your laptop.
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