Charles Krug wrote:
....
So how does the Sawstop distinguish between cutting wood and cutting a
finger? I can't see how it happens that the saw knows the difference.

It distinguishes a change in capacitance from the moisture in the
flesh...that's why there's the override switch for known really wet wood
to avoid spurious discharge--of course, then it's a standard saw.

I've not looked for it, but I assume the patent is on file and would be
available on the PO site...