SawStop
I remember watching a SawStop ad quite sometime ago, where they used a sausage to demonstrate the product.
It’s basically a circular tablesaw that prevents accident by going from full force to a complete stop in case someone puts his finger/hand/body part there.
The saw detects a finger by using an electric current. So if something conductive enough goes through the blade, it goes to a full stop.
Breaks have to be really harsh to completely stop a circular saw spinning that fast… and it is. A piece of metal (which ends completely destroyed) gets shoved in the blade. Costs 60 bucks to replace it, but as the video says, better than a finger.
In this video, the creator goes one step ahead and puts his oen finger to the task. Something I believe he’d never do if he didn’t trust his own invention… 
Source: TechEBlog
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