Logic / Unit 8 Logic 385 short lesson, about 20 seconds
Appeal to Ignorance
Captions available
The idea
Treating absence of proof as proof of absence — or of presence.
In practice
"No one has proven the lake monster doesn't exist, so it does." Runs equally well in reverse, which is the tell.
Where people slip
Near-miss: a qualified search that should have found something and didn't is real evidence. "We tested the water supply and found no contaminant" earns its conclusion.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
Something wrong in this lesson? Flag it · Sources for Logic