For a long time the human instinct to understand was thwarted by facile religious explanations.

The visions we offer our children shape the future.

The simplest thought, like the concept of the number one, has an elaborate logical underpinning.

There is much that science doesn't understand, many mysteries still to be resolved. In a Universe tens of billions of light-years across and some ten or fifteen billion years old, this may be the case forever. We are constantly stumbling on new surprises

Even today the most jaded city dweller can be unexpectedly moved upon encountering a clear night sky studded with thousands of twinkling stars. When it happens to me after all these years it still takes my breath away.

The sacred truth of science is that there are no sacred truths.

What began in deadly competition has helped us to see that global cooperation is the essential precondition for our survival. Travel is broadening. It's time to hit the road again.