Find hard to understand

[nat965]

What is something, even after being explained a lot of times, you still find hard to understand?

For me, it's any hard mathematics subjects such as algebra. :S

[despect]

Probably coding on a website, I remember a friend tried to explain it and I still dont understand it..

[Red]

Deffo maths. It never sunk in ever!

[scottish]

Nothing that I can think of?