The only competition I have is myself.

The only way to change behavior is through manipulation of reinforcement contingencies.

The stars near the galactic center are like cosmic clocks, helping us map spacetime.

我们不能总是为我们的青年建造未来，但我们可以为未来建造我们的青年。

Live simply so that others may simply live.

Every song is a piece of my soul.

你注意力的质量决定了你生活的质量。