10 Weirdest News Stories of 2013

Urine Time for Science
According to the new law of urination, it likely took the elephant only about 20 seconds to accomplish that great voiding of the bladder. derejeb/iStock/Thinkstock

2013 will no doubt be remembered as the year that we discovered a magnificent, fascinating truth about the animal kingdom:

All mammals pee for 20 seconds.

Give or take. What David Hu -- a mechanical engineering professor at Georgia Institute of Technology -- actually found was that mammals that weigh more than 2.2 pounds (or 1 kilogram) all pee for roughly the same duration.

Why, you might ask, wouldn't an elephant take more time than a dog? It has to do with the flow rate and even the size of the urethra [source: Arnold]. And there's A LOT of pee coming from an elephant, several bathtubs' worth, according to Hu [source: Arnold].

All kidding aside, this research can help contribute to research about prostate problems or help veterinarians troubleshoot issues with an animal's urinary tract.