In Darwin's lifetime, physicists did not know about radioactivity, and therefore thought that the earth would cool down rather quickly.

How would physicists ever know which one described this universe?

And that, as any physicist knows, is supposed to be impossible.

The precise formulation of the idea is made difficult by the fact that physicists do not yet know how many independent physical constants there are.

Yet as any physicist knows, efficiency can be flipped on its head.

Brack gave Cochrane a look the physicist knew too well.

Oppenheimer famously said that in building the bomb the physicists had known sin.

Never mind whether a physicist might actually know something about child rearing or dreams or running a state.

Surely Beekman's physicists knew what they were talking about.

Perhaps a physicist would know at once why this whole idea was absurd.