It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment.

CO2 is so beneficial...it would be crazy to try to reduce it

If you want to have a program for moving out into the universe, you have to think in centuries not in decades.

Plasma seems to have the kinds of properties one would like for life. It's somewhat like liquid water--unpredictable and thus able to behave in an enormously complex fashion. It could probably carry as much information as DNA does. It has at least the potential for organizing itself in interesting ways.

We should try to introduce our children to science today as a rebellion against poverty and ugliness and militarism and economic injustice.

Well germ warfare of course exists. There have been on a small scale... There have been, of course, a few people who got killed with anthrax right here in Princeton.

It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will be the century of biology.