The biology of the human body is an enigma to many of us, and the finer points of human anatomy still stymie some of the world's foremost experts. Scientists are constantly making new breakthroughs about why our bodies react certain ways, but there are still many unanswered questions about the workings of the complex human form.

As the above video by Alltime10s illustrates, mysteries surrounding the ways our bodies work are some of humanity’s biggest questions. Most puzzles have a theorized explanation that isn’t yet accepted as scientific fact, but some issues simply cannot be answered.

For instance, it’s common knowledge that each person has a unique set of fingerprints, but what do they actually do? It was previously thought that these ridges helped to grip objects, but a recent study debunked the theory. More recent research has suggested that fingerprints increase our sense of touch, and another theory is that the ridges help to disperse liquid and better handle wet objects.

Click on the video above to learn more about some unsolved mysteries of the human body — like what’s the deal with puberty?

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