Mankind's greatest achievements have come about by talking and its greatest failures by not talking. It doesn’t have to be like this. - Stephen Hawking

There's a sick joke that the reason we have not been contacted by an alien civilization is that civilizations tend to destroy themselves when they reach our stage. But I have sufficient faith in the good sense of public to believe that we might prove this wrong.

A society in which the individual feels responsible for his or her actions is more likely to work together and survive to spread its values.

I don't think the human race will survive the next thousand years, unless we spread into space.