Until recently, scientists believed that it was an inflammatory condition.
Some scientists believed that the collapse could be exploited to produce "desktop" nuclear fusion.
Sixty years ago, scientists believed that schizophrenia was caused by emotional conflict with the patient's parents.
At the time, scientists believed that bacteria reproduced asexually by dividing into genetically identical halves.
Scientists believed that what little water remained was trapped in the planet's frozen poles.
For years, scientists believed that the fungus injected toxins into the plant, killing cells and gorging on the waste.
Until now, scientists believed that sediment-rich marine environments are detrimental to the growth of coral reefs.
In the 1960s, some computer scientists believed that a workable artificial intelligence system was just 10 years away.
Other scientists believed that the H5 protein, because of its molecular structure, could not easily infect human cells.
Indeed, scientists believed that Chelonoidis nigra abingdoni had become extinct until George was discovered on Pinta in 1972.
Before 1987, scientists believed that redwoods, among the earth's oldest and tallest trees, had no life at their tops.
