“I was being unclear about what I was saying and I did not fully understand what I was trying to explain to [my PhD supervisor]. He would drill deeper and deeper and deeper until I realized that there was something that I didn’t have clear in my mind. He really taught me how to think deeply about things.
“When you understand something really deeply, you can explain it in a really short way. True understanding is when you are able to explain something so simply that almost anybody can understand it. That means you really understand it.”
— Luis von Ahn