If we want clean air and water, we must start by protecting our forests.

Innovation is key to solving the energy challenges of tomorrow.

The only thing more painful than being an active forgetter is to be an inert rememberer.

The study of intelligence must be grounded in the study of symbol systems.

"The only thing that could spoil a day was people. People were always the limiters of happiness except for the very few that were as good as spring itself."

真正的发现之旅不在于寻找新的风景，而在于拥有新的眼光。