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It is said that you can only have a certain strain of cold once
And there are 200 strains or something. Can you have more than one cold at once? If so, whammo - inject the lot, take the pain and then never have another cold.
I think I've just cured the common cold. This is my gift to humanity, no charge. Just call it the Balonz serum or some shit like that.
Peace.