Coal, oil and gas are called fossil fuels, because they are mostly made of the fossil remains of beings from long ago. The chemical energy within them is a kind of stored sunlight originally accumulated by ancient plants. Our civilization runs by burning the remains of humble creatures who inhabited the Earth hundreds of millions of years before the first humans came on the scene. Like some ghastly cannibal cult, we subsist on the dead bodies of our ancestors and distant relatives. - Dr. Carl Sagan

Our perceptions are fallible. We sometimes see what isn't there. We are prey to optical illusions. Occasionally we hallucinate. We are error-prone.

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

Whatever the reason you're on Mars, I'm glad you're there, and I wish I was with you.

Advances in medicine and agriculture have saved vastly more lives than have been lost in all the wars in history.

We have entered, almost without noticing, an age of exploration and discovery unparalleled since the Renaissance.

In a complex universe, in a society undergoing unprecedented change, how can we find the truth if we are not willing to question everything and to give a fair hearing to everything?