21.   Rather, the finding confirmed a popular theory.

22.   Scientists are not sure about exactly what causes a hangover, but one popular theory holds that it is a minor case of alcohol withdrawal syndrome.

23.   Scientists at the University of Washington report Thursday that a popular theory of obesity guiding most dietary studies and drug research may be wrong.

24.   The findings contradict popular theories on how animal brains develop specialized regions for seeing, hearing, sensing touch and, in humans, generating language and emotional states.

25.   The Hennessy Balanced Fund is the first mutual fund to invest according to a popular theory called Dogs of the Dow.

26.   The most popular current theory of how HIV causes AIDS is that the virus exhausts the immune system by making millions of copies of itself every day.

27.   The most popular theories assign them religious or astronomical significance.

28.   The most popular theory, proposed by John Ostrom of Yale University, is that birds evolved from small, fast-running therapod dinosaurs.

29.   The most popular theory is that sapiens evolved once, in Africa.

30.   The popular theory about Powlus is that he has been an underachiever here.