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

The thing about a theory in science is it allows you make predictions. Evolutionary theory allows us to predict what apples will taste good next harvest.

The strange thing about grinding that might surprise many people is that you can grind things and shape them using materials that are generally somewhat softer than the thing you're grinding and shaping.

When or if answers are found, you can be assured those answers will lead to more questions. Is the troubling or wonderful? It depends on your view of your place in nature, your place among the stars; I suppose.

For me, the meaning of life is pretty clear: Living things strive to pass their genes into the future.

There is no debate in the scientific community...We need [Congress] to change things, not to deny what's happening.

But as the cerebellum degrades with age, so does the quality of memories. The memories are there, but they're not as good.