The boundary condition of the universe is that it has no boundary.
Though we feel we can choose what we do, our understanding of the molecular basis of biology shows that biological processes are governed by the laws of physics and chemistry and therefore are as determined as the orbits of the planets.
There is a very real danger that we will kill everything on this planet now that we have the technological power to do so.
The laws of science do not distinguish between the past and the future.
If the government is covering up knowledge of aliens, they are doing a better job of it than they do at anything else.
A lot of prizes have been awarded for showing the universe is not as simple as we might have thought.
We are entering an increasingly dangerous period of our history. But I’m an optimist.
Real science can be far stranger than science fiction and much more satisfying.
I want my books sold on airport bookstalls.
Some individuals are better able than others to draw the right conclusions about the world about them and act accordingly. These individuals will be more likely to survive and reproduce so their pattern of behaviour and thought will become dominant.
If everything in the universe depends upon everything else in a fundamental way, it might be impossible to get close to a full solution by investigating parts of the problem in isolation.
If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?
Mankind’s greatest achievements have come about by talking and its greatest failures by not talking. It doesn’t have to be like this.
Sometimes I wonder if I’m as famous for my wheelchair and disabilities as I am for my discoveries.
Why do we remember the past, but not the future?
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.
Don’t be disabled in spirit as well as physically.
We are all different. There is no such thing as a standard or run-of-the-mill human being, but we share the same human spirit.
We are very, very small, but we are profoundly capable of very, very big things.
It’s a crazy world out there. Be curious.