Everyone you will ever meet knows something you don't.

We are just a speck, on a speck, orbiting a speck, in the corner of a speck, in the middle of nowhere.

To leave the world better than you found it, sometimes you have to pick up other people's trash.

Science is the best idea humans have ever had. The more people who embrace that idea, the better.

You and I are made of stardust. We are the stuff of exploded stars. We are therefore, at least 1 way that the Universe knows itself. That, to me, is astonishing.

There's nothing I believe in more strongly than getting young people interested in science and engineering, for a better tomorrow, for all humankind.

I speak with dogs frequently. They don't really talk, but I feel they're communicating.

The natural world is a package deal; you don't get to select which facts you like and which you don't.

The more you find out about the world, the more opportunities there are to laugh at it.

Science is the best thing humans beings have ever come up with. And if it isn't, science will fix it.

The Earth is not 6,000 or 10,000 years old. It's not. And if that conflicts with your beliefs, I strongly feel you should question your beliefs.

Art is art. You can take it or leave it. Liking it or not liking it does not make you a better person, and who you like or dislike results in the same thing.

Men like to borrow kisses because they know they will have to pay them back.

The failure of the citizens to pray for the nation will lead to its collapse.

I think there's always room for humor, especially when you're talking about really serious issues.

After the Beatles and Dylan, there's this assumption that you are a singer-songwriter, or that if someone else is writing your rhymes, you're a fake rapper.

There's no getting away from it: you have to clean.

Great opportunity is all around you and it will inspire you to either take advantage of it or deny that it is there.

We have to learn how scientists arrive at decisions. Once you use the scientific method, it doesn't mean that your decisions will be perfect. They'll be far more accurate than just opinions.

I have a 20-year-old son, I have a 12-year-old son and I'm so afraid for them.

What makes your life different from the next n***a? There is something special about you, so let me help you bring out your individuality.