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See the video at http://3dvinci.blogspot.com/2010/02/classroom-rage-with-sketchup-physics.html for how this SketchUp plugin can be used. 

Add standard and customized parametric components - like flange beams, lumbers, piping and more - to your Google SketchUp model by using sketchup.engineeringtoolbox.com.

Dozens of types of graph paper that can be downloaded as PDFs. Invaluable for sketching and other assignments!

THIS from the two New Yorkers who designed the Glif, a tripod adapter for the iPhone 4. It's a hunk of rubberized plastic with a threaded bushing that will ultimately retail for $15. Last week, its designers hoped to raise $10,000 through the crowdfunding site Kickstarter. In the first three days, the total contributions were $70,000. Fund-raising will continue until November 2nd. Tom Gerhardt makes interactive kiosks. Dan Provost works for frog design, a product design company. The two are long-time friends; they have never moved an idea all the way to production on this scale before.