煤炭使美国在世界范围内保持竞争力。

"With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how."

We must remain curious and never stop questioning the world around us.

最严重的罪行不是由违反规则者犯下，而是由那些刻板遵守规则者所为。