Also,the broken windows theory did not fully investigate the exact conditions of disorders that appeared to lead to crime.

VOA: special.2009.03.03

His theory of Martian life became so complex that he made maps of cities and waterways on the planet.

VOA: special.2010.07.11

Another theory says that the stress of having to pay constant attention to survive leads to Third Man hallucinations.

VOA: special.2010.02.24

Darwin had been working on his theory for over twenty years when he published " On the Origin of Species."

VOA: special.2009.12.01

His theory was that Martians were trying to bring water to the warm areas near the equator of the planet.

VOA: special.2010.07.11

Studies support the theory that there are several causes, instead of a single environmental cause or genetic problem.

VOA: special.2009.01.06

Charles Darwin developed the theory of how living things develop from simpler organisms over long periods of time.

VOA: special.2009.02.25

Recent studies also support a theory that a combination of genes is linked to the development of lupus.

VOA: special.2009.04.14

Yet it was the work of naturalist Alfred Russel Wallace that pushed Darwin to finally release his theory.

VOA: special.2009.12.01

He developed the theory of evolution that life on Earth developed through the process of natural selection.

VOA: special.2009.12.16

One theory is that the shape developed over the ages to improve this shark's sense of smell.

VOA: special.2010.08.03

In his early years, Mister Galbraith was greatly influenced by the economist Thorstein Veblen and his book, "The Theory of the Leisure Class."

VOA: special.2011.05.01

In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

Still,a theory exists that amyloid plaques are an effect of the disease, not the cause.

VOA: special.2009.09.15