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I'm sure that if I could get a grain of sand traveling fast enough (hypothetical - it would melt first) it would boil flesh and vaporize bone.

Not to keep beating the dead horse, but I thought I'd point out that this is exactly the kind of thing that happens in space. A grain-sized meteor can pretty much punch right through a communications satelite. That's why all the systems are redundant. There's basically no way to shield against it!