7 Proofs That Humans Are Still Evolving
We all studied evolution at school, and, although it takes centuries for any evolutional changes to be noticed, scientists all over the world continue to study it.
We at Bright Side decided to share some evidence that humans are still evolving.
1. Adults can drink milk.
The gene that helps humans digest milk has developed through the course of evolution. In the beginning, people could only drink milk when they were babies. But after cows, sheep, and goats were domesticated, the necessary gene developed.
Did you know that now only about 1/3 of all people can digest milk? What's curious is that they are mostly those whose predecessors lived in Europe, the Middle East, Africa, and South Asia.
2. Not everybody has wisdom teeth.
Our diet today includes more soft food, which is why we don't really need wisdom teeth because our other teeth don't have as much work to do as before. Today's dentists mostly remove wisdom teeth.
3. Some of us have blue eyes.
In the beginning, all people had brown eyes. But around 6,000-10,000 years ago, we started mutating, which led to some of us having blue eyes today.
Even though the gene for blue eyes is not dominant, it manages to survive. Research shows that men with blue eyes find women with blue eyes more attractive. This is why the gene still survives.
4. The average height is increasing.
Mankind's average height has changed over the years. Sometimes we were taller, sometimes shorter, but on average we are getting taller. Over the last 100 years, men have become 4 inches taller.
The biggest reasons why height increases are our diet and health.
5. We have less hair.
The amount of hair that modern people have is significantly less than our ancestors. Now we don't have as much hair on our body. The only places where there haven't been any changes are our head and armpits.
We can't say that someday we won't have hair at all because hair helps regulate body temperature. Eyelashes protect the eyes, and the hair inside the nose helps clean the air we breathe. Eyebrows keep sweat out of the eyes.
As you can see, hair is very important, so it's unlikely that we won't have any at all in the future.
6. We can breathe at extreme heights.
Tibetans live in one of the most unfriendly places in the world: the Himalayas. Yet they somehow can breathe air that doesn't have much oxygen in it. This is possible only thanks to evolution.
Research showed that Tibetans have a low hemoglobin level. People who are not so well prepared have a high hemoglobin level at such heights, which makes it very hard for them to breathe.
People living at great heights have a special gene that helps them to breathe there.
7. We now have backaches.
Modern people walk on 2 legs, unlike our predecessors who walked on 4. Our spinal cord has adjusted to an upright posture. However, many of us suffer from backaches.
Research showed that such problems are common among people whose vertebrae are not too different from chimpanzees'. Humans and chimpanzees have a common predecessor, and some of us still have that shape of vertebrae. This is probably the reason why we have backaches — the spine is not yet completely adjusted to walking upright.