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Shao, you keep saying all of these things are possible, but have you actually seen them done? I have seen many amazing feats at martial arts demonstrations, but none that defy the laws of science. If the only "proof" is from hearsay, or vague 17th century writings based on hearsay, I don't think you have much of a case. If the reason people don't demonstrate such feats as piercing armor and stopping blades and catching bullets in their teeth is because it is some sacred martial arts secret, why are you privy to such knowledge without such secrecy? None of it makes any sense.
Concrete and ice break because they are actually pretty weak in tension. When you strike a slab it puts the surface you strike into compression and the opposite surface into tension. Metal being relatively strong in both compression and tension is a different story. Metal also has the potential of being much less rigid, therefore absorbing more of the impact by denting and bending rather than cracking.
Bullets work because force is equal to mass multiplied by acceleration. Lead is fairly dense, and therefore has pretty good mass compared to a lot of other materials. When fired a bullet has an amazing amount of acceleration. These combined give a bullet a lot of force. Apply this force to a small area and there you go. The human hand is not terribly massive and can certainly not reach the acceleration potential of a bullet.
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