Teach principles not formulas.

It turns out that all life is interconnected with all other life.

If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives.

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

The electron is a theory. But the theory is so good we can almost consider them real.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

There is nothing that living things do that cannot be understood from the point of view that they are made of atoms acting according to the laws of physics.