<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested, in accordance with the scientific method, using a predefined protocol of observation and experiment . Established scientific theories have withstood rigorous scrutiny and embody scientific knowledge . </P> <P> The definition of a scientific theory (often contracted to "theory" for the sake of brevity) as used in the disciplines of science is significantly different from the common vernacular usage of the word "theory". In everyday speech, "theory" can imply that something is an unsubstantiated and speculative guess, the opposite its meaning in science . These different usages are comparable to the opposing usages of "prediction" in science versus everyday speech, where it denotes a mere hope . </P>

What is the most accepted form of scientific ideas
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