Saws That Stop For Fingers 😱 (How?)

If you accidentally touched a table saw, you'd probably think your fingers would be cut off. But this isn't always the case.

You see, some modern, high-end saws actually know the difference between wood and your skin. Once your finger comes in contact with these special saws, it immediately detects the electrical conductivity from your skin. This triggers an immediate mechanical response that stops the blade in less than 5 milliseconds.