system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Saw Stops. How do they set off for a hotdog/finger, yet not be set off against lumber and such as the blade is intended to do? Being that lumber is harder and takes more pressure to cut through, vs a hotdog.

Are they not set off by pressure against the blade, such as hard materials and soft materials?
gpt
They're set off by electrical conductivity. The hotdog/finger is quite conductive, so it completes the circuit that causes the stop to trigger.

Wood isn't very conductive, so it doesn't set off the trigger.