Though many believe that he was killed by the Mafia, Jimmy Hoffa's body has never been found and the truth about what happened to him remains a mystery.Ever since Jimmy Hoffa’s disappearance on July 30, 1975, the mystery surrounding what happened that day has taken on an almost-mythic quality, so much so that it eclipses nearly everything else about him, which was no easy feat. To this day, Jimmy Hoffa’s death overshadows almost the entirety of his historic life.

Biologists suggest that humans lack tails because of a random genetic mutation that appeared 20 million years ago. Wikimedia CommonsAnimals today use their tails for a variety of purposes, but humans lost theirs millions of years ago. Humans and apes share many physical characteristics, some which have remained, and some which have evolved, but there’s always been one main difference in that monkeys have tails, and humans do not. A new study pinpoints a mutation in a gene called TBXT as the reason for this.

Private Wing O. Hom has been missing in action since Feb. 2, 1944 — and now, 79 years later, his remains have finally returned to the United States.Defense POW/MIA Accounting AgencyU.S. Army Pvt. Wing O. Hom who, went MIA on Feb. 2, 1944. The remains of U.S. Army Private Wing O. Hom have finally been identified using mitochondrial DNA testing nearly 80 years after he went MIA. Hom had left his hometown of Boston to fight against German forces in Italy as part of Company B, 7th Infantry Regiment, 3rd Infantry Division in the U.

Jie Zhao/Getty Images Despite protests including a petition containing 11 million signatures, China’s Yulin festival will see about 10,000 dogs and cats killed over the next ten days so that they can be eaten. Each year, the city of Yulin in China’s southern Guangxi region celebrates this enormously controversial event. “It’s been a tradition for years for us to celebrate the festival. We can’t change it simply because they (animal lovers) love dogs,” a local resident told The Associated Press.

Gender absolutely exists on a spectrum — and these animals prove it.Getty Images/ATI Composite For definitive proof that gender is indeed fluid, look no further than the animal kingdom. There, certain organisms change their reproductive identities or adapt the behavior of the opposite sex based on a time-specific need. Some animals even have working male and female genitalia. Here are ten fascinating animals whose sex isn’t black-and-white: Hermaphrodite Animals: 1. Bearded Dragon Aka/Wikimedia Commons