ElephantGuts said:
But what is sound if no one hears it? Maybe it only causes vibrations, but they don't become "sound" until they are heard.
No, it's not, sound is exactly that, vibrations in the air. It doesn't matter if anyone hears it or not.
edit: Actually, vibrations in
anything. Solids, liquids, gas, etc.
Dictionary definition: http://www.bartleby.com/61/65/S0576500.html
Shade Jackrabbit said:
A similar argument came up in computer engineering today. Basically things are "true" when the masses of the trusted sources (i.e. scientists in these days) believe something. But they could all be wrong. I mean, why does gravity work? Because people believe it does. Maybe we're just all horribly wrong, and there's some other reason. But we're right because more people believe it to be true than not.
As much as I hate to disagree, last time I checked, scientists weren't sure how gravity worked, so your example is moot.