Sustainability isn't just about planting trees—it's about planting the right trees in the right places, for the right reasons.

Small, deliberate actions practiced consistently can lead to big changes in happiness levels.

There is only one real sin, and that is to persuade oneself that the second-best is anything but the second-best.

NP完全性的概念为理解问题的复杂性提供了一个强大的工具。