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NJ5 said:
I meant "can't track fingers in general"... the fact that they can track fingers in some special cases is pretty irrelevant.

If you make a calculator which can multiply by the number 0, it's still usual to say that it can't multiply. That's the sense of the word "can't" I was going for, not some mathematically precise statement.

What a ridiculous debate :P

Actually, it would be a similar example if the calculator could only multiply by zero if a person with large hands used it.