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.

The thing about smart people is that they seem like crazy people to dumb people.

It matters that you don't just give up.

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

Only a very few would allow creatures like us to exist. Thus our presence selects out from this vast array only those universes that are compatible with our existence. Although we are puny and insignificant on the scale of the cosmos, this makes us in a sense the lords of creation.

Women. They are a complete mystery.

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.