To the delight of third grade humorists everywhere, scientists have proven that Uranus smells bad. The seventh planet from the sun has many claims to fame: Its axial tilt of 98 degrees is the most extreme in the solar system, essentially turning the planet sideways, and it also ranks absolute last on the order of planets from hottest to coldest, with temperatures that drop below -300 degrees Fahrenheit. However, Uranus tends to be overshadowed by the chuckles that often accompany its name, a fact that won't be helped by the revelation that it might also be the stinkiest planet of...