Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

除了蜜蜂，我无所畏惧。

"The stage is where I feel most alive."

The best science is done with an open mind and a willingness to learn.