"The most exciting breakthroughs of the 21st century will not occur because of technology but because of an expanding concept of what it means to be human."

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I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.

— Stephen Hawking