"We are all in the gutter, but some of us are looking at the stars."

Ignorance more frequently begets confidence than does knowledge.

"Collaboration is the key to unlocking the mysteries of the universe."

"Behind every post is a real person with real feelings—let's not forget that."

教学的艺术在很大程度上在于唤醒年轻心灵的自然好奇心，并用知识的营养来满足它。