Answer:
There are millions of me. I am very small but when moving fast I am deadly.
Three little letters, a paradox to some. The worse that it is, the better it becomes.
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
It happens when something has been cut with H2O.
Through its wounds, water does run. It once held many but now has none. What is it?
When is it bad luck to see a black cat?