Table Saw auto stops when detecting a finger instead of wood

There are around 60,000 medically treated accidents on table saws every year. This inventor developed a system that stops the blade of a saw if it comes in contact with your finger. The system can actually tell the difference between your finger and the wood. The blade has a sensor that detects electrical conductivity, wood is not very conductive so the saw goes right through it, but a salty wet finger is conductive which is detected at less than a thousand of a second, which triggers the system and stops the blade instantaneously.