Correct Posture

At a cafe near Princeton University…

A bald old man was sitting at a corner while he drank his coffee. At the same time, he was reading the thesis in his hand.

Sitting opposite him was Edward Witten.

When Edward Witten aw the thesis in his old friend's hand, he asked, "What are you reading?"

"An interesting thesis submission," said Professor Deligne as he turned the page. He continued, "It's about the Polignac's conjecture."

He could not help but add, "An interesting proof."

Edward Witten asked, "Lu Zhou?"

"Yes," answered Professor Deligne as he held a pen and wrote a few question marks on the paper. In a casual manner, he said, "Missing that conference was your biggest mistake of the year."

Edward Witten smiled and said, "Haha, I agree. Especially since I met him in person, my regrets have gotten stronger."

Deligne looked at him and said, "Oh? When did you fly across the Pacific Ocean?"