Every lump of coal we mine keeps the lights on in someone's home.

Long-termism isn't repeating one big right thing, but persistently improving small things.

I like dogs. You always know what a dog is thinking. It has four moods. Happy, sad, cross and concentrating. Also, dogs are faithful and they do not tell lies because they cannot talk.

科学在开放和合作的环境中蓬勃发展。