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[[Falsifiability]] is a commonly used criterion to determine whether a particular proposition is [[science|scientific]] or non-scientific.  Essentially, a proposition is considered "scientific" if it ''could'' be proven wrong by experiment, but no experiment has proven it false.   

[[Falsifiability]] is a commonly used criterion to determine whether a particular proposition is [[science|scientific]] or non-scientific.  Essentially, a proposition is considered "scientific" if it ''could'' be proven wrong by experiment, but no experiment has proven it false.   

For instance, the proposition "Gravity pulls objects to the Earth at 32 ft/s²" can be tested by dropping an object in Earth's gravitational field.  If we did this and it didn't fall, or it fell at a different speed, we would know that the proposition is false.  Because we test it and it is ''not'' proven false, we can consider the proposition to be "scientific."

For instance, the proposition "Gravity accelerates objects towards the Earth at 32 ft/s²" can be tested by dropping an object in Earth's gravitational field.  If we did this and it didn't fall, or it fell at a different speed, we would know that the proposition is false.  Because we test it and it is ''not'' proven false, we can consider the proposition to be "scientific."

However, other propositions are not testable.  For instance, "There is an invisible unicorn in my room."  Since there is no way to test whether this proposition is true or not (it's invisible), then it is not ''scientific'' to claim that the unicorn is there.

However, other propositions are not testable.  For instance, "There is an invisible unicorn in my room."  Since there is no way to test whether this proposition is true or not (it's invisible), then it is not ''scientific'' to claim that the unicorn is there.