If At First You Don't

So Great A Contribution To Physics Was Two New Sciences That Scholars Have Long Maintained That The Book Anticipated Isaac Newton's Laws Of Motion.

Mankind's Greatest Achievements Have Come About By Talking And Its Greatest Failures By Not Talking. It Doesn’t Have To Be Like This.

We Are Entering An Increasingly Dangerous Period Of Our History. But I'm An Optimist.

I Don't Think The Human Race Will Survive The Next Thousand Years, Unless We Spread Into Space. There Are Too Many Accidents That Can Befall Life On A Single Planet. But I'm An Optimist. We Will Reach Out To The Stars.

Scientific Discovery May Not Be Better Than Sex, But The Satisfaction Lasts Longer.