The second half of the twentieth century is a complete flop.

With the opening of the second decade of the twentieth century it seemed that the stage was set for the last act in an unquestioned evolutionary drama.

The problem of the twentieth century is the problem of the color line.

If the end of the twentieth century can be characterized by futurism, the twenty-first can be defined by presentism.

You must believe in free will; there is no choice

Our knowledge is a little island in a great ocean of nonknowledge.