Human Body — Page 4
The incredible human body
267 facts
Japanese researchers discovered an unknown anatomical structure beneath the navel.
The structure is a dense vertical sheath that wraps around a fat pocket and extends deep into the connective tissues…
The human skull has microchannels connecting the inner surface to the brain.
Spanish researchers described a network of microchannels in the skull that could be key in neurological diseases…
About 74 percent of people may have a type of giant DNA hiding in their mouth.
Researchers at the University of Tokyo discovered Inocles, extrachromosomal DNA elements with an average of 350…
Interoception is described as the human body's hidden sixth sense.
Interoception is a network of internal neural pathways that allows the brain to coordinate breathing, monitor…
Human skin hosts about one billion bacteria per square centimetre.
The skin is the largest organ in the human body and is home to a vast community of microorganisms, including…
A person produces between half a litre and one and a half litres of saliva per day.
Saliva is essential for digestion, as it contains enzymes that begin to break down food. It also lubricates the…
A network of microchannels has been discovered in the human skull that may play a crucial role in brain health.
A CSIC team described a network of tiny channels on the inner surface of the skull that connects bone marrow to the…
Giant DNA has been discovered hiding in the human mouth.
Three-quarters of people may host a new type of genetic material called Inocles, which could impact research on oral…
The Harbin skull found in China belongs to an unknown human species.
In 2025, a team of researchers confirmed that the Harbin skull, at least 146,000 years old, belongs to a Denisovan…
The world's smallest tattoo has been made on a tardigrade.
In 2025, researchers used electron beams to engrave dots on a thin layer of ice covering a tardigrade's body. The…
The first single-cell epigenetic map of the entire human body has been published.
An international team led by the Salk Institute published in the journal Science the first single-cell epigenetic map…
AI has helped discover hidden human proteins and their functions.
A team of researchers used AI to identify human proteins that until now had no known function. Among them, TM184C…
The inner surface of human lungs, if stretched, would cover a tennis court.
The lungs contain about 300 million alveoli, small sacs where gas exchange takes place. If all were opened and…
Humans are slightly taller in the morning than at night.
During the day, gravity compresses the spinal discs, which lose water and become thinner. When sleeping lying down…
The cornea of the human eye has no blood vessels.
The cornea is the transparent layer covering the front of the eye. Since it has no blood vessels, it gets oxygen…
The human heart pumps about 7,500 litres of blood per day.
At rest, the heart beats between 60 and 100 times per minute and pushes about 70 millilitres of blood with each beat…
The human body contains enough iron to make a nail about 7.5 centimetres long.
The iron in the human body, mostly in the haemoglobin of blood, totals between 3 and 4 grams. That amount would be…
The tongue print is unique to each person, just like a fingerprint.
Like fingerprints, the pattern of papillae and grooves on the tongue is unique to each individual. No other person…
The human nose can distinguish more than a trillion different smells.
A 2014 study published in the journal Science concluded that the human nose can distinguish more than a trillion…
The human body loses about 600,000 skin particles every hour.
The skin constantly renews itself. Every hour, the human body releases about 600,000 dead skin particles. Over a…
The human eye can distinguish about 10 million different colours.
The human retina has three types of cones, cells sensitive to red, green and blue light. The combination of signals…
The strongest muscle in the human body is the masseter, in the jaw.
The masseter is the strongest muscle in the human body relative to its size. It can exert a force of up to 90…
The bone marrow produces about 2 million red blood cells per second.
The bone marrow in long bones continuously produces red blood cells to replace those that break down. Every second…
The liver is the only internal organ capable of fully regenerating itself.
The liver can regenerate even after losing up to 75 per cent of its tissue. The process occurs through the division…