Sustainability isn't an option—it's a necessity for the future of our planet.

"I write to make sense of the world around me."

Mathematics is the language in which the gods talk to people.

To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

Your attitude determines your altitude.

重要的不是想法，而是实现想法。