A mechanical writer

A video of a 240-year-old mechanical doll, and automaton, which writes. Amazingly complex, and even to some degree programable. Thanks to Jim.

Journey of the Guitar Solo

SawStop

I saw this in the recent remake of Arthur (which isn't as bad as I feared, pretty good actually).
3,000 people US people per year loose fingers to saws! Ten per day (not ten fingers, ten people. Probably more fingers).
The machine feels the electric change if a body touches the blade and stops. The reaction time is amazing.
I know I wouldn't let my kids play with a table saw which didn't have this feature.     :-)

Projection art and big robot arms

[Thanks to Bert]

I recommend clicking through and catching the big version.