My two year old is learning his colors. Two of his favorites are "Wed" and "Gween." My shop is in my garage, which our little guy toddles through 4-5 times a day when he's getting loaded into the car in the driveway.
On three separate occasions, he's trotted over to the table saw, shouted "Gween," and tried to make it to the 'on' button. Out of justified paranoia, I physically unplug every power tool the minute I'm done using it. So he's never yet turned on a tool.
The 'what if' scenarios are terrifying.
For those with kids or grandkids, something to conisder.
John