Originally Posted by DrRocket

I wish people would stop saying that "you can't prove a negative". In some cases you most certainly can prove a negative. Teaching this claptrap to youngsters is a decided disservice.

There are proofs for the following negatives, among many others:

1) There is no rational number whose square is 2.

2) There is no largest prime number.

3) Anthrax is not caused by a miasma in the pasture.

4) The sun is not powered by an external electrical current.

5) Fire is not an outflow of phlogiston.

6) The Earth is not 6000 years old.

7) All material cannot be constructed from earth, air, fire and water.

8) There is not a sixth platonic solid.

9) It is impossible to "square the circle" (construct a square of area pi).

10) There is no general solution by radicals for quintic polynomials.

Originally Posted by Chuck

A unicorn is a mythological beast so, by definition, is not real. If some animal with a horn growing out of its forehead were found it would be a real animal and not mythological so, by definition, it would not be a unicorn.

Do I get a prize?