cool stuff to build

[Jadzia]

Let's have a thread for cool technology stuff we can build at home.

I found this today: Burning Laser

 

[judge alba]

cant think where i saw it but i'm pretty sure someone did domething similar to 'shoot' a lser from it, think they used a blue ray thing or something. it was awhile back mind so i could be wrong

 

[M'Sharak]

Fairly low-tech, but requiring a certain degree of optical precision, that old Internet favorite, the Solar Death Ray.

The FAQ: http://www.solardeathray.com/FAQ.html

Some others people have built: http://www.solardeathray.com/SDR_world.html

And very important, the Warning: http://www.solardeathray.com/warning.html

 

[JustAFriend]

There's already a whole website devoted to building tech:

http://blog.makezine.com/