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The 19th century was the age of Individualism; the 20th and 21st are the ages of Socialism.

It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will be the century of biology.

I think there can be a positive sort of futurism even in a presentist society. But I think it's a kind of futurism that envisions augmenting human ability and intellect rather than creating some artificial machine intelligence that displaces us.

I think future generations will say the late 20th century and the early 21st century was a time of great convulsions and upheavals.

The young people today are the 21st century.

The 20th century is a period defined by cultural and artistic movements. However, the 21st century creative-scape that we occupy now doesn't really have movements in the same way. Instead it's made up of diverse individuals working across various platforms simultaneously; art, architecture, film, music and literature.

The 21st century can and must be an American century. It began with terror, war, and economic calamity. It is our duty to steer it onto the path of freedom, peace, and prosperity.

The philosophy of one century is the common sense of the next.

I think the first decade of this century is going to be remembered as a time of extremism.

Life in the twentieth century is like a parachute jump: you have to get it right the first time.