In 5 billion years, the expansion of the universe will have progressed to the point where all other galaxies will have receded beyond detection.

If our species is to survive, our future will probably require outposts beyond our own planet.

You shouldn't be afraid of science. Accepting the reality of nature makes life more exciting and even more precious.

The universe is the way it is, whether we like it or not.

I can't prove that God doesn't exist, but I'd much rather live in a universe without one.

Science is only truly consistent with an atheistic worldview with regards to the claimed miracles of the gods of Judaism, Christianity and Islam. Moreover, the true believers in each of these faiths are atheists regarding the specific sacred tenets of all other faiths. Christianity rejects the proposition that the Quran contains the infallible words of the creator of the universe. Muslims and Jews reject the divinity of Jesus.

The root cause of the looming energy problem - and the key to easing environmental, economic and religious tensions while improving public health - is to address the unending, and unequal, growth of the human population. And the one proven way to reduce fertility rates is to empower young women by educating them.