11.   My friend Gail has a theory based on an interview with a four-year-old in a backyard sandbox.

12.   My theory is based upon empirical evidence, nothing scientific.

13.   She bases this theory on her extensive knowledge of how and when certain circuits are wired.

14.   That the game is at home is what Baldwin bases his must-win theory on.

15.   The new theory is based on inability to escape.

16.   The prion theory is based on the work of Dr. Stanley B. Prusiner of the University of California at San Francisco.

17.   The second theory is based on the Bernouilli effect.

18.   The theory is based largely on experiments carried out on Minnesota prairies and oak savannas by Tilman and his colleagues.

19.   The theory is based entirely on a statement Bush made at a town hall meeting in Orlando, Fla., in December.

20.   The theory is based on known or suspected life in our solar system.