I'm not a perfect person, I never claimed to be. But I'm trying every day to be better than I was yesterday.

"The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together."

The most powerful tool in science is not technology, but imagination.

有时，你必须回头看，才能理解前方的事物。

Space is a substance.

膨胀是一个非常大胆的想法，但它似乎是解释宇宙观测特征的唯一方法。