Our happy hour fact to amaze your drinking buddies with.

Long thought to be worthless, there is increasing evidence the appendix serves a purpose.

Charles Darwin was the first to suggest the appendix was a vestigial organ left over from when our ancestors ate leaves. But Darwin was also under the impression that the appendix was much rarer in mammals than it actually is -- current research says 70 percent of all primate groups contain a species with an appendix.

Furthermore, now scientists believe the appendix serves as a useful storehouse for good bacteria, and can create extra white blood cells.

A surprising upgrade that should give other vestigial organs -- Randy Jackson and Joe Biden, for instance -- hope for a brighter future.

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