Cookie Box Requires Two to Open

If you are struggling with the temptation to eat cookies too often, or you want to encourage sharing and cooperation in your kids, you might consider a cookie box that requires two people (three hands) to open. Thijs Sondag designed and built this nice-looking box in just that way.

(YouTube link)

See more pictures of the box and its mechanism, and if you want to build your own, the instructions are at Google Drive. -via Laughing Squid

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He actually made a cover for the lid mechanism, which you can see in the picture gallery.

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I appreciate the artist wanting to show off the mechanism, but it would be more effective if it were hidden on the bottom of the lid.

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Neat video! May I suggest that it's not a dorsal fin? I would say the fin is located ventrally...

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The way these fish swim is interesting, but the most fascinating thing is that they can sense electric fields around their bodies:

http://www.hizook.com/blog/2010/01/14/bode-plots-fish-awesome-electric-field-sensing-fish

(RE: the above link, how cool is it that they've made Bode plots of the fish's motion? That's something any good engineer can appreciate!)

This same form of sensing has been used by other robots; for example, here is a robot using electric field sensing to plug itself into wall outlets for automatic recharging:

http://www.hizook.com/blog/2010/01/03/self-feeding-robots-robots-plug-themselves-wall-outlets