There could be whole antiworlds and antipeople made out of antiparticles. However, if you ever meet your antiself, don't shake hands! You would both vanish in a great flash of light.

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.

Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do.

I thought Eddie Redmayne portrayed me very well... At times I thought he was me.

The human race does not have a very good record of intelligent behavior.

There is a fundamental difference between religion, which is based on authority, [and] science, which is based on observation and reason. Science will win because it works.

The meaning in life is not out there but inbetween our ears. In many ways this makes us the lords of creation.