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

VOA: special.2009.04.14

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

VOA: special.2009.01.06

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

A scientific theory represents the best explanation of how the natural world works.

VOA: special.2009.12.01

"When Darwin first proposed his theory in eighteen fifty-nine, he had no concept of a gene, no concept of a chromosome, no concept of mutation, and certainly no concept of things like DNA and RNA."

VOA: special.2009.12.01

As a result,he was almost upstaged by a younger colleague, Alfred Russell Wallace, who developed the theory of evolution through his own research.

VOA: standard.2009.11.25