SawStop GIF.
This is the type of table saw that is marketed as stopping as soon as you accidentally cut your finger. I've never used one, but I know that they work by monitoring the difference in electrical conductivity between wood and human flesh. A small amount of voltage is applied to the blade, and the current is continuously monitored. Once a change in this current is detected, a braking block is forced into the saw blade.
After various licensing battles involving tool companies and the SawStop inventor, an amateur woodworker and physicist named Steve Gass, this same technology is now finding its way into other mainstream saw brands.
https://diqn32j8nouaz.cloudfront.net/sawstop.gif
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