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Originally Posted by Vulcan
I may not understand how you mean by certain but where I'm sitting and typing this I know that I'm resting the heels of my hands on my desk.
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But what if I asked you if you were were certain that it was all you were doing? It's easy for us to positively affirm things through observation, but you have to keep in mind that we only ever touch the surface of reality (reality being limited to our senses and is sometimes extended to what we can infer).
For example, if you asked someone that question 1,000 years ago, he would have probably said he was certain that is hands were only resting on his desk and nothing else, but now we know there is a lot more going on that we cannot sense on both macro and micro levels. Your desk is litterally being hurled through space at xx,xxxx km/h. There are also tiny particles moving through your hands and your desk. While it's true that your hands are only resting on your desk from your perspective, however in reality, they are not resting at all. Everything in the universe in dynamic and changing constantly.
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It's a good desk, made it myself in high school many years ago. This is all I can go by, my feelings and other senses.
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But don't you see how limiting that is? Humans evolved 5 basic instincts to help us survive, and all 5 of them are specific to what our little spec of dust in the universe required. I think it's arrogant for a species on one little planet to assume that their senses are even close to knowing even a minute fraction of what is going on in reality.