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The important thing is not to stop questioning. Curiosity has its own reason for existing.

Science is the light that illuminates the darkness of ignorance.

Success is the ability to go from one failure to another with no loss of enthusiasm.

The human mind is so complex and things are so tangled up with each other that, to explain a blade of grass, one would have to make a diagram of the universe.

The concept of nondeterminism in computation is one of the most important ideas in computer science.