An iconic Phish show is back like you've never seen it before with remastered VHS video of the band's famed 1991 concert at ...

Chalk dust is spread in the path of a laser beam. The dust scatters light in the beam path, showing it moves in a straight line. Mount the laser on the lab stand, with the laser pointing to the side ...

Only use regular chalk for this idea though, and avoid insecticide chalks, a substance that is actually banned in the U.S.

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...