Changes

:''In everyday use, the word "theory" often means an untested hunch, or a guess without supporting evidence. But for scientists, a theory has nearly the opposite meaning. A theory is a well-substantiated explanation of an aspect of the natural world that can incorporate laws, hypotheses and facts.''

:''In everyday use, the word "theory" often means an untested hunch, or a guess without supporting evidence. But for scientists, a theory has nearly the opposite meaning. A theory is a well-substantiated explanation of an aspect of the natural world that can incorporate laws, hypotheses and facts.''

In science a theory is something that ties together facts. For example, an apple falling to the ground when you let go of it is a fact. From this we can draw the conclusion that there is some force pulling it down. This theory is called the theory of gravity.

In science a theory is something that ties together facts. For example, an apple falling to the ground when you let go of it is a fact. From this we can hypothesize that there is some force pulling it down. The set of observations and mathematical formulae that explain how this force works, and the experiments which demonstrate that those observations and formulae are correct is called the Theory of Gravity.

==Notes and references==

==Notes and references==