This isn't a smooth piece of silicon, its purposely made sharp to puncture bio membranes. If it were made out of copper, or iron it wouldn't last very long - w

This isn't a smooth piece of silicon, its purposely made sharp to puncture bio membranes. If it were made out of copper, or iron it wouldn't last very long - who cares. But Si structures will last forever, its oxide an excellent (the best?) passivating layer ensuring no chemical or biological systems ever degrade it. Si's stability is why silicosis is so pernicious. Carbon deposits can, theoretically, be cleaned by the lungs (specifically by peroxides), but Si? Nothing. Let's add that, like in communication theory, In bio I'n not impressed by 90%. How does that compare, say, with a bare surface of brass?