So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist.

There could be whole antiworlds and antipeople made out of antiparticles. However, if you ever meet your antiself, don't shake hands! You would both vanish in a great flash of light.

"Sooner or later disasters such as an asteroid collision or a nuclear war could wipe us all out, But once we spread out into space and establish independent colonies, our future should be safe."

The human race is just a chemical scum on a moderate-sized planet, orbiting around a very average star in the outer suburb of one among a hundred billion galaxies. We are so insignificant that I can't believe the whole universe exists for our benefit. That would be like saying that you would disappear if I closed my eyes.

In fact, if one considers the possible constants and laws that could have emerged, the odds against a universe that produced life like ours are immense.

If the total energy of the universe must always remain zero, and it costs energy to create a body, how can a whole universe be created from nothing?

Science can lift people out of poverty and cure disease. That, in turn, will reduce civil unrest.