The brain uses over a quarter of the oxygen used by the human body.<span class="Apple-converted-space">&nbsp;</span>

Your heart beats around 100,000 times a day, 36,500,000 times a year and over a billion times if you live beyond 30.<span class="Apple-converted-space">&nbsp;</span>

Red blood cells carry oxygen around the body. They are created inside the bone marrow of your bones.<span class="Apple-converted-space">&nbsp;</span>

The color of humans skin is determined by the level of pigment melanin that the body produces. Those with small amounts of melanin have light skin while those with large amounts have dark skin.<span class="Apple-converted-space">&nbsp;</span>

Adult lungs have a surface area of around 70 square meters (76.5 yards)!.

Humans have a stage of sleep that features rapid eye movement (REM). REM sleep makes up around 25% of total sleep time and is often when you have your most vivid dreams.<span class="Apple-converted-space">&nbsp;</span>

Most adults have 32 teeth.

The smallest bone found in the human body is located in the middle ear. The staples (or stirrup) bone is only 2.8 millimeters long (about 1/10 of an inch).<span class="Apple-converted-space">&nbsp;</span>

Your nose and ears continue growing throughout your entire life.<span class="Apple-converted-space">&nbsp;</span>

Infants blink only once or twice a minute while adults average around 10.<span class="Apple-converted-space">&nbsp;</span>

As well as having unique fingerprints, humans also have unique tongue prints.

The left side of your body is controlled by the right side of your brain, while the right side of your body is controlled by the left side of your brain.

Antibiotics are only effective against bacteria, they won’t help in fighting off a virus.

It takes the body around 12 hours to completely digest after eating.

Your sense of smell is around 10000 times more sensitive than your sense of taste.<span class="Apple-converted-space">&nbsp;</span>

Muscle makes up around half of the total human body weight. Muscle tissue is also around 15% denser than fat tissue.

It takes 17 muscles in the face for us to smile and 43 muscles to frown.

If muscle strength is regarded as the ability to use force on something then the jaw muscle (masseter) is the strongest in the body.

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