We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.

Succeed in spite of management.

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory.

I think computer viruses should count as life.

Gravity is so strong that space is bent round onto itself, making it rather like the surface of the earth. If one keeps traveling in a certain direction on the surface of the earth, one never comes up against an impassable barrier or falls over the edge, but eventually comes back to where one started.

Before we understand science, it is natural to believe that God created the universe. But now science offers a more convincing explanation.

It was recently discovered that research causes cancer in rats.