过去总是存在，只是有时比其他时候更明显。
"The past is always present, it's just that sometimes it's more present than at other times."
翻译：这句话体现了从易到难、从细到大的哲学思想，强调了细节和基础的重要性。
好奇心推动发现。没有它，科学就会停滞不前。
We are all hostages of our own memories.
There is no such thing as a quality problem.
By used books. They have the same words as the new ones. Also libraries.