In 1997, a group from Chicago came up with a theory of how it works.

I asked our physics teacher here at my school and he was unable to come up with a theory.

Davis has come up with a new theory on property prices.

If it broke, he'd come up with a new theory.

But just recently my staff came up with a theory as to what their motive may be.

Sometimes scientists come up with a theory that is wrong.

Maybe we can come up with a theory as to how this started and why no one's getting better.

You came up with a theory and it didn't prove out.

Then lay the papers out and find if the students can come up with a theory of what is going on.

Anyone can come up with a theory about the treatment of a disease.