You'd think scientists have probed the human body long enough to discover most of its hidden secrets. I mean, come on, it's hard to miss an organ.
Before this scientific discovery, the human body had five vital organs: the brain, heart, kidneys, liver and lungs.
There's also other organs, like the ones responsible for reproduction and, of course the biggest of them all, our skin. All together, we have 80.
It's still unclear whether this organ will make it alongside the big five, but it definitely plays a crucial process in how our bodies work.
Scientists claim that it can explain how diseases like cancer spread, so this could be a huge breakthrough in modern medicine.
Interestingly, the organ was discovered by chance.
During routine endoscopies, which involves a device being inserted into the body to probe the stomach and the upper part of the intestines, medical experts stumbled upon something surprising.
While they were getting a microscopic view of the tissue inside a person's gut, they noticed a dense wall of tissue surrounding the bile duct, which is responsible for the digestion of food.
When these medical experts discovered this unexplained phenomenon, they contacted Neil Theise, a pathologist at New York University School of Medicine.
They tried to find this tissue in other parts of the body, and indeed they did. What they discovered is astonishing...