Based on this research, he developed a new theory of weight control.

That changes for most kids at around age 3 or 4, when they develop theory of mind.

At the time, new theories of heat were being developed.

I'm beginning to develop a theory, and I'd like to check it with him.

I'm the one who developed the theory your new toy is based on.

Now please go back to square one and develop the theory that was put forward in 1880.

While you were on your way here, I developed a preliminary theory.

The Shadow would take another course, to develop a theory of his own.

Different people may develop more, or less, effective theories of mind.

This theory of recognition was developed in the 19th century.