Is knowing half the battle?

Science shows that it's often not true.

This is known as G.I. Joe fallacy and is considered a psychological bias.

We know optical illusions, but they still trick our eyes; we know the .99 price tricks in the shops, but they still impact our behavior.

Knowing itself doesn't necessarily change our behavior. It may be worthless if we don't act on that new knowledge. If we don't deal with our habits and emotions which are a huge inertia.

So if You think You've learned something, but Your behavior didn't change, did You actually learn anything at all?