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Steve Hoefer at Grathio labs shows off his Arduino based door opener, which responds to knocks on the door bye timing the gaps between the sounds. If the gap matches the programmed knock, it unlocks. Let's never use keys again!

Know a little bit about Arduino and care to make your own? Check out his Instructables post!

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I think this is exactly what a construction site needs; gas-powered, all terrain wheelbarrows speeding in between precarious scaffolding. What could go wrong?

~NSHA

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Don't feel like getting vaporized by an M80 during your fireworks celebration? Fear not! The fine folks at Grathio Labs have devised a way to make fireworks that add just a bit of extra pop to your celebration. Follow the instructions in the video, extrapolate, and make something cool like a chain of them! Just don't be dumb and do it indoors/in your hand/without eye protection/near flammable material. You can kludge with one hand or one eye, but it definitely doesn't make things easier...

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