Despite the fact that we have spent our entire lives in them and scientists continually investigate the human body, there’s still a whole lot we don’t know about our bodies! There are a number of unsolved mysteries about the human body and here are five of them that will surprise you.
Why do we Have a Dominant Hand?
As humans, we are so used to having a dominant hand, and identifying people as “righties” or “lefties,” that we probably take it for granted. But if you think deeply about it, the fact that we have one hand with significantly better functionality than the other seems a bit odd.
Given everything we know about evolution and “survival of the fittest,” why haven’t we evolved to have two totally adept hands? It’s one of the biggest human body mysteries out there. Of course, there are some people who can use both hands with equal skill, but they are a very small percentage of the population.
Why Do We Yawn?
We’ve been yawning since we were in the womb, and yet scientists have no explanation as to why. While there are no shortage of theories, the true reason for yawning remains a mystery.
One theory suggests that we yawn to regulate the temperature of our brains, since sleep deprivation or boredom can cause our brain temperature to drop. Another suggests that we yawn to give our bodies a jolt, since our heart rates tend to increase and our eye muscles tense up after we yawn. Maybe both are true.
Why Do We Have Blood types?
Like the appendix, the different blood types we have offers an inkling into evolutionary history. Different blood types have varying abilities to fight off different infections, and scientists believe that they began evolving around 20 million years ago in human ancestors and other apes.
Combined with natural selection for certain blood types against certain infections, [evolution] produced the diversity of the human blood types that we see and recognize in this era, but what scientists don’t know is why. As it stands, no definitive theory or theories explains why blood types differ among humans.
Why do we have fingerprints?
We all know that our fingerprints are so unique that no two people have the same ones, not even identical twins. But why do we humans have these swirly patterns on their fingers in the first place?
For many years, scientists thought they were there to help human fingers grip things but it turns out, fingerprints actually allow less of our skin to come into contact with objects than perfectly smooth fingertips would. So they have nothing to do with gripping.
While there are a few theories about the evolutionary purposes of these unique patterns, including that they protect our fingers or provide touch sensitivity, scientists haven’t been able to figure out a definitive explanation.
What Is The Use Of Our Appendix?
As an organ that causes many people lots of pain and whose removal has absolutely no effect on our bodies, the appendix seems to be more trouble than it’s worth. For hundreds of years, scientists, all the way back to Charles Darwin, were in agreement that, while a plant-eating human ancestor needed an appendix for digestion, it was only left over from evolution and had no real function for modern humans.
However, another theory which has become more popular in the scientific community lately, postulating that the tube-like organ actually houses and protects a host of good bacteria. It’s to wait and see if the theory gets proven.