All truly great thoughts are conceived by walking.
We must shed the old stereotype of anarchists as bearded bomb throwers furtively stalking about city streets at night.
If genius has any common denominator, I would propose breadth of interest and the ability to construct fruitful analogies between fields.
Skepticism is the agent of reason against organized irrationalism--and is therefore one of the keys to human social and civic decency.
Human life is the result of a glorious evolutionary accident.
Nature is what she is - amoral and persistent.
Darwin's principle of natural selection leads to the prediction that the proper way to analyze any evolutionary development is to see the new features as adaptive to environments. And that's a perfectly good principle. The problem is that there are many evolutionary biologists who view everything that happens in evolution as directly evolved for adaptive benefit. And that just doesn't work. Whenever you build a structure for adaptive reasons, the structure is going to exhibit properties that have nothing to do with adaptation. They're just side consequences.
What is instinct? It is the natural tendency in one when filled with dismay to turn to his wife.
You frighten a lot of scientists. If they say that climate is not changing, they lose their research grants. And some people cannot afford that; they become silent, or a few of us speak up, because we think that it's for the honesty of science, that we have to do it.
You cannot teach a person something he does not already know, you can only bring what he does know to his awareness.
The only way you can be successful on a post or win at it is to be at cause over it.