Coal’s future depends on our ability to make it cleaner and more efficient.
There is no path to peace. Peace is the path.
I'm not here to be perfect, I'm here to be real.
数学不是一门演绎科学——那是陈词滥调。当你试图证明一个定理时,你不仅仅是列出假设然后开始推理。你所做的是反复试验、实验和猜测。