Mathematics is not a spectator sport. You have to do it to understand it.
Every piece of plastic we produce should have a clear path to being reused or recycled.
幸福就像一只蝴蝶,当你追逐它时,总是抓不到,但如果你安静地坐下来,它可能会落在你身上。
"We are lonesome animals. We spend all our life trying to be less lonesome."