If everyone agreed to become vegetarian, leaving little or nothing for livestock, the present 1.4 billion hectares of arable land (3.5 billion acres) would support about 10 billion people.

The brain and its satellite glands have now been probed to the point where no particular site remains that can reasonably be supposed to harbour a nonphysical mind.

Let us see how high we can fly before the sun melts the wax in our wings.

The great challenge of the twenty-first century is to raise people everywhere to a decent standard of living while preserving as much of the rest of life as possible.

Overall, the human brain is the most complex object known in the universe - known, that is, to itself.

The biological evolutionary perception of life and of human qualities is radically different from that of traditional religion, whether it's Southern Baptist or Islam or any religion that believes in a supernatural supervalance over humanity.

Religious belief itself is an adaptation that has evolved because we're hard-wired to form tribalistic religions.