If we do not learn to eliminate waste and to be more productive and more efficient in the ways we use energy, then we will fall short of this goal [for the Nation to derive 20 percent of all the energy we use from the Sun, by 2000]. But if we use our technological imagination, if we can work together to harness the light of the Sun, the power of the wind, and the strength of rushing streams, then we will succeed.

Because I know about the Holy Land, I've taught lessons about the Holy Land all my life, and - but you can't bring peace to Israel without giving the Palestinian also peace. And Lebanon and Jordan and Syria as well.

I am a nuclear physicist by training and a deeply committed Christian. I don't have any doubt in my own mind about God who created the entire universe. But I don't adhere to passages that so and so was created 4,000 years before Christ, and things of that kind.

During the 1960s, we used twice as much oil as during the 1950s. And in each of those decades, more oil was consumed than in all of mankind's previous history.

Americans long thought that nature could take care of itself-or that if it did not, the consequences were someone else's problem. As we know now, that assumption was wrong; none of us is a stranger to environmental problems.

We know definitively that Al-Qaida isn't all over Afghanistan anymore. According to CIA estimates, there are less than a hundred Al-Qaida members in the entire country. Most of them are in Pakistan. So, it's hard for me to understand why we're still fighting there and sending in more and more troops. I would get out of Afghanistan as quickly as possible.

During the period of the Saturn-Apollo missions we were pilgrims in space, ranging from home in search of knowledge. Now we will become shepherds tending our technological flocks, but like the shepherds of old, we will keep our eyes fixed on the heavens.