The great advantage of old age is that you can be as rude as you like.

The act of writing is an act of defiance against the chaos of the world.

"Collaboration across industries is key to solving the world's energy challenges."

数学不是沿着一条清理得很好的高速公路小心行进，而是一次进入陌生荒野的旅程，探险者常常会迷路。