Facts about yourself



You are an ape.

You are a great ape, which implies we are related to other great apes such as gorillas, chimps, and orangutans.

You share 98.7% of your DNA with a chimpanzee.

Ever since researchers sequenced the chimp genome in 2005, they have known that humans share about 99% of our DNA with chimpanzees, making them our closest living relatives.

This suggests that we did not evolve from chimps, but rather from the same ancestor as bonobos, with our longer predecessors being gorillas and orangutans.

You are the only animal that cries tears.

Pet owners often claim their dogs cry. Darwin thought monkeys and elephants wept. But modern scientists believe the only animal to really break down in tears is us.

There are three sorts of tears, according to biology. The first are basal tears, which our eyes produce on their own to lubricate and clean our eyes. 

These are produced by our accessory lacrimal glands, which are positioned behind the eyelids. Then there are reflex tears, which you've probably experienced if you've ever chopped an onion or had your eye poked. The third type is emotional tears, which we can, to some extent, regulate. 

The latter two kinds are produced by lacrimal glands located on the top exterior of our eye sockets.

The third emotional tear is one of the things that distinguishes us.

Your brain is about 70% water.

According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart comprise 73% water, while the lungs are around 83% water. The epidermis is 64% water, the muscles and kidneys are 79% water, and even the bones are 31% water.

You have 30,000 genes. 

(Each chromosome contains hundreds to thousands of genes, which carry the instructions for making proteins. Each of the estimated 30,000 genes in the human genome makes an average of three proteins.) Read More here.

You have the more bones than a giraffe.

Despite being the tallest and one of the largest animals in the animal kingdom, humans outnumber giraffes in terms of bone count, with an adult human having 206 bones and a giraffe having 170 bones.

You are born with 300 bones, but by adulthood you only have 206.

As your child develops into childhood, much of the cartilage will be replaced by true bone. But something else happens, which explains why 300 bones at birth become 206 bones by adulthood. Many of your baby's bones will fuse together, reducing the amount of bones.

The average person walks 120,700.8 km in a lifetime.

"The average moderately active individual walks roughly 7,500 steps each day," according to SnowBrains.com. If you maintain that daily average and live to the age of 80, you will have walked around 216,262,500 steps throughout your lifetime.

Your blood circulates around your body 3 times a minute.

Your blood volume is around 5.6 litres (6 quarts). This 5.6 litres of blood circulates three times each minute throughout the body.

In one day, your heart beats 100,000 times and 35 million times in a year.

Your heart beats around 100,000 times each day and approximately 35 million times per year. The human heart will beat more than 2.5 billion times in a lifetime. Give a tennis ball a strong squeeze. You're exerting roughly the same amount of force that your heart does when pumping blood out to the body. 

Each of your red blood cells lives for about 120 days before it is replaced.

Red cells have an average life span of around 120 days before being replaced by phagocytosis by reticuloendothelial macrophages as a result of accumulated changes during their lifetime.

You breathe about 11,000 liters of air each day.

When at rest, the normal adult inhales and exhales roughly 7 or 8 litres of air each minute. This amounts to around 11,000 litres of air every day. Inhaled air contains roughly 20% oxygen. Exhaled air contains roughly 15% oxygen.

Your lungs are the only organs in your body that float in water.

The only organ that can float in water is the lungs. Each of your lungs includes around 300 million alveoli, which are balloon-like structures that replace the carbon-dioxide waste in your blood with oxygen. When these structures are filled with air, the lungs become the sole floatable organs in the human body.

You have more bacteria in your mouth than there are people on Earth.

Given that 1 ml of saliva contains around 100 million microbes, it is estimated that individuals swallow up to 100 billion microorganisms of bacteria per 24 hours.

You lose about 100 hairs from your head each day. (It's normal to loose 100 hairs a day)

It is typical to shed 50 to 100 hairs every day. Excessive hair shedding occurs when the body sheds considerably more hairs each day. Telogen effluvium is the medical word for this condition.

You are made out of exploded star. 

(We're made of star stuff," Sagan famously stated in one episode. His statement sums up the fact that the carbon, nitrogen and oxygen atoms in our bodies, as well as atoms of all other heavy elements, were created in previous generations of stars over 4.5 billion years ago.)

Just Myself

I like writing about Science, games and free software.

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