Ever wanted to do a manly project involving lots of wood but worried you might get a splinter or maybe even cut your hand off? well Sawstop can help you (with the hand part, you will still get splinters).
The table saw is designed to instantly (well ok, within 5 milliseconds) retract into it’s housing when it detects the electrical conductivity of a finger (or other appendage) as opposed to the wood it is supposed to be cutting.
They even have a video showing it cutting someone’s sausage! (a hotdog, what were you thinking??)
(more at sawstop)