One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which mathematical models describe the universe we live in. It turns out that a mathematical model involving imaginary time predicts not only effects we have already observed but also effects we have not been able to measure yet nevertheless believe in for other reasons. So what is real and what is imaginary? Is the distinction just in our minds?

I think the human race has no future if it doesn't go into space.

Don't be disabled in spirit as well as physically.

Using e-mail, I can communicate with scientists all over the world.

The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car.

Science can explain the universe without the need for a Creator.

The world has changed far more in the past 100 years than in any other century in history. The reason is not political or economic but technological-technologies that flowed directly from advances in basic science. Clearly, no scientist better represents those advances than Albert Einstein: TIME's Person of the Century.