[Richard Feynman] truly believed that if you couldn't explain something simply, you didn't understand it.

There is so much to groak; So little to groak from.

Einstein, in the special theory of relativity, proved that different observers, in different states of motion, see different realities.

A lot of my research time is spent daydreaming - telling an imaginary admiring audience of laymen how to understand some difficult scientific idea.

You have to say now that space is something. Space can vibrate, space can fluctuate, space can be quantum mechanical, but what the devil is it?

Unforeseen surprises are the rule in science, not the exception. Remember: Stuff happens.

I was from a poor Jewish family in the South Bronx. My father was a plumber, but when I was 16, he got sick and I had to take over. Being a plumber in the South Bronx wasn't fun.

We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball.

I was going to engineering school but fell in love with physics.

Science blogs bore me. When everyone is an expert, no one is an expert.

At some point we have to give up and say that's just the way it is. Or, not give up and push on.

I've called Chicago home for nearly 25 years. It's a city of broad shoulders and big hearts and bold dreams; a city of legendary sports figures, legendary sports venues, and legendary sports fans.

With me it's always about first impressions.

When you don't respond to bad behavior, you get more of it.

If you tell most people what libertarians think, they immediately assume that you cannot mean it all the way, that you're really just taking a position for argument's sake.

Unfortunately, in many cases, people who write science fiction violate the laws of nature, not because they want to make a point, but because they don't know what the laws of nature are.

The clouds appeared and went away, and in a while they did not try anymore.

Even when I lose faith in myself there is something in me that speaks through and says I am not finished yet.

Mankind must be positively and constructively wary of mankind, of their fellow man, of their families, of the members of their faith community, of their fellow-citizens.

Instead of being a person to whom things happened, I became a person who made things happen.

Men and women are immigrants in each other's worlds.