This is the most fascinating proof of how knowledge differs from understanding:

So amazing to witness the moment when he learns/unlearns, and how it seems to just click in place, somehow. Absolutely mind boggling how he actually had to unlearn something which he’s known for decades in order to learn the new way to ride a bike. It took him much longer than I thought it would, at that, and comparing that to the experience of his son…. Wow!

And yeah, I am deliberately vague, and hope you get curious enough to actually press play on the video above. This really is something worth spending a few minutes on! Ok?