I hope we find evidence of dark matter in the lab and in outer space. This would go a long way to proving the correctness of string theory, which is what I do for a living. That is my day job. So string theory is a potentially experimentally verifiable theory.

No matter how beautiful the theory, one irritating fact can dismiss the entire formulism, so it has to be proven.

Some people seek meaning in life through personal gain, through personal relationship, or through personal experiences. However, it seems to me that being blessed with the intellect to divine the ultimate secrets of nature gives meaning enough to life.

In some sense, gravity does not exist; what moves the planets and the stars is the distortion of space and time.

One problem with politics is that it is a zero sum game, i.e. politicians argue how to cut the pie smaller and smaller, by reshuffling pieces of the pie. I think this is destructive. Instead, we should be creating a bigger pie, i.e. funding the science that is the source of all our prosperity. Science is not a zero sum game.

So often, science fiction helps to get young people interested in science. That's why I don't mind talking about science fiction. It has a real role to play: to seize the imagination.

It's risky to allow radiation to constantly go up into the atmosphere. The main criticism of this approach of entombing it is that it would cost too much, involve too many resources and people. But think of the cost of having all the crops impounded by the government, all the milk being thrown into the river, people's livelihoods destroyed.