Richard Lindzen

And for about 3 million years, 40,000 years is the dominant period.

And then you go back further than that, and you don't have ice ages for a long time.

Well, with these, it's not clear that solar activity was the issue.

Could have been many factors.

Well, you know, how should I put it?

With the ice ages...

As I say, orbital theory was the main thing.

The fact that you have various factors determining the orbit of the Earth versus the Sun and so on give you periodic changes in the incoming radiation as a function of geography in the Earth.

There are a lot of things that are peculiar about science in general.

You know, one of them is numbers.

I mean—

It isn't having more people work on something.

You want to have an environment where there's freedom.

I often think, I mean, Will is familiar with this.

There's a photograph from 1929 of all the world's physicists at a Salve conference.

This is a golden age of physics.

If you quintupled the number of people working on physics, would you have improved the situation?

I doubt it.

And so, you know, I think freedom is much more important than just piling on.

Here's the photo.