Is zero a natural number?

[brewer]

Ouch, ouch, ouch, my late high school-early undergrad brain hurts. I expect a delivery of fentanyl and midazolam. Not propofol, no Jackson for me.

Just for fun, does negative or positive ever apply to zero?

Depends a bit on the book used.  One way of resolving ambiguities is as follows:

Positive: >0
Negative: <0
Non-negative: >=0
Non-positive: <=0

So, 0 is not negative, not positive, but is non-negative and non-positive.

Well that's just double talk. Don't even try to tell me about swamp land in Florida.

I suppose next you'll tell me that infinity exists between 0 and 1.