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

In fact, if one considers the possible constants and laws that could have emerged, the odds against a universe that produced life like ours are immense.

The media need superheroes in science just as in every sphere of life, but there is really a continuous range of abilities with no clear dividing line.

If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.

Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.

There should be no boundaries to human endeavor. However bad life may seem, there is always hope.

I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.