The study of mathematics is like air or gravity – it’s everywhere, even if you don’t see it.

I don’t think anything is unrealistic if you believe you can do it.

Short-term gains at the expense of the environment will always lead to long-term losses.

恐龙灭绝是因为它们没有太空计划。如果我们因为没有太空计划而灭绝，那是我们活该！