[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.

We explore because we are human and we want to know. I hope that Pluto will help us on that journey.

If any one of about 40 physical qualities had more than slightly different values, life as we know it could not exist.

In the last 200 years the population of our planet has grown exponentially, at a rate of 1.9% per year. If it continued at this rate, with the population doubling every 40 years, by 2600 we would all be standing literally shoulder to shoulder.

Don't be disabled in spirit as well as physically.

Do you ever wonder how much deeper the ocean would be without sponges?

Succeed in spite of management.