The Erdős discrepancy problem fascinated me because it was so simple to state yet so deep in its implications.

For all that has been, thank you. For all that is to come, yes!

Never stop learning. The moment you think you know it all is the moment you fail.

你无法改变过去，但可以改变未来。

不要害怕在厨房里失败，那里能学到最好的教训。