Art makes us human, music makes us human, and I deeply feel that science makes us human.

When you buy a jacket, you pick the size to ensure it fits. Similarly, we live in a universe in which the amount of dark energy fits our biological make-up. If the amount of dark energy were substantially different from what we've measured, the environmental conditions would be inhospitable to our form of life.

Science is the greatest of all adventure stories, one that's been unfolding for thousands of years as we have sought to understand ourselves and our surroundings.

When kids look up to great scientists the way they do to great musicians and actors, civilization will jump to the next level

The central idea of string theory is quite straightforward. If you examine any piece of matter ever more finely, at first you'll find molecules, atoms, sub-atomic particles. Probe the smaller particles, you'll find something else, a tiny vibrating filament of energy, a little tiny vibrating string.

The pinpoints of starlight we see with the naked eye are photons that have been streaming toward us for a few years or a few thousand.

I believe the process of going from confusion to understanding is a precious, even emotional, experience that can be the foundation of self-confidence.