人似乎分为好人和坏人。好人睡得好一些，而坏人似乎能更好地享受醒着的时间。
Collaboration across borders and industries is the key to solving the energy challenges of our time.
跨越国界和行业的合作是解决我们这个时代能源挑战的关键。
"In observational studies, we often have to rely on assumptions that are not directly testable."
创造力是我们生活中意义的核心来源。
Policy debates should be grounded in rigorous empirical analysis.
"We are all apprentices in a craft where no one ever becomes a master."