Who are we, if not measured by our impact on others? That’s who we are! We’re not who we say we are, we’re not who we want to be - we are the sum of the influence and impact that we have, in our lives, on others.

In our time, we have sifted the sands of Mars, we have established a presence there, we have fulfilled a century of dreams!

The method of science, as stodgy and grumpy as it may seem, is far more important than the findings of science.

If you are only skeptical, then no new ideas make it through to you.

Science is a way of thinking much more than it is a body of knowledge.

UFOs: The reliable cases are uninteresting and in the interesting cases are unreliable.

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.