Those who seek power at any price detect a societal weakness, a fear that they can ride into office.

For all its material advantages, the sedentary life has left us edgy, unfulfilled, even after 400 generations in villages and cities, we haven't forgotten: The open road still softly calls like a nearly forgotten song of childhood.

Even through your hardest days, remember we are all made of stardust.

When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it.

The reappearance of the crescent moon after the new moon; the return of the Sun after a total eclipse, the rising of the Sun in the morning after its troublesome absence at night were noted by people around the world; these phenomena spoke to our ancestors of the possibility of surviving death. Up there in the skies was also a metaphor of immortality.

The universe is a pretty big place. If it's just us, seems like an awful waste of space.

We are the only species on the planet, so far as we know, to have invented a communal memory stored neither in our genes nor in our brains. The warehouse of this memory is called the library