艺术越极端，就越能揭示我们的本质。

Natural experiments are a powerful tool for understanding causal relationships in the real world.

We are all obsessed with the idea of the frontier, but it's a frontier that keeps receding.

Sustainability is not just a goal, it's a responsibility we owe to the future.

Joy sparks the urge to play, interest sparks the urge to explore, contentment sparks the urge to savor and integrate, and love sparks a recurring cycle of each of these urges within safe, close relationships.