Dissent is the mark of freedom.

It is important that students bring a certain ragamuffin, barefoot irreverence to their studies; they are not here to worship what is known, but to question it.

No science is immune to the infection of politics and the corruption of power.

Ask an impertinent question and you are on the way to the pertinent answer.

Man is unique not because he does science, and his is unique not because he does art, but because science and art equally are expressions of his marvelous plasticity of mind.

Knowledge is an unending adventure at the edge of uncertainty.

The hand is the cutting edge of the mind.

We have to understand that the world can only be grasped by action, not by contemplation. The hand is more important than the eye ... The hand is the cutting edge of the mind.

Man masters nature not by force, but by understanding

One aim of physical sciences had been to give an exact picture the material world. One achievement of physics in the twentieth century has been to prove that that aim is unattainable.

A genius is a man who has two great ideas.

The end of the world can be cozy at times.

Nothing quite delivers the full experience of being out there like floating around soaking up the warmth of the early morning rays with a brush in hand.

Follow your own star!

Clowns work as well as aspirin, but twice as fast.

The way we do things is to begin.

It's not Africa that is destroying the African rainforest, it's selling concessions to timber companies that are not African, they are from the developed world - Japan, America, Germany, Britain.

I construct my memories with my present. I am lost, abandoned in the present. I try in vain to rejoin the past: I cannot escape.

When you're doing bad things, you just don't know whether you can conquer them or not. I found out how strong I could be when I was motivated, and I'm kind of proud of that.

Folks, we are in the midst of dangerous times like you cannot believe, and Donald J. Trump is the target.

I love to play hockey. I'm a huge hockey fan and I love to play as well.