物理定律在宇宙中无处不在，这是一个深刻的真理，将我们所有人联系在一起。

有疑问时，就说真话。

Old minds are like old horses; you must exercise them if you wish to keep them in working order.

The important thing is not to stop questioning. Curiosity has its own reason for existing.

Pessimism leads to weakness, optimism to power.