5.

“Too many people believe the ‘we only use 10% of our brains’ claim. If that were true, we wouldn’t have such large brains. It would be an evolutionary disadvantage to lug around a huge brain that consumes a ton of energy if we only used 10% of it. It’s absolute BS.”

—u/wynnduffyisking

“The classic analogy is the traffic light. We only use 33% of a traffic light at a time, but if we used 100% it wouldn’t tell us anything useful. The absence of activation also communicates information!”

—u/triplealpha