Human Body — Page 2
The incredible human body
133 facts
You have a blind spot in each eye where the optic nerve connects to the retina.
Because there are no light-sensitive cells in this exact spot, your brain automatically fills in the missing…
The average person will walk the equivalent of 3 times around the world in their lifetime.
Based on an average daily step count, humans will take over 100,000 steps every year, accumulating about 115,000…
The human heart creates enough pressure to squirt blood up to 30 feet.
When the left ventricle contracts, it pumps blood out to the entire body with enough force that, if unobstructed, it…
Goosebumps are an evolutionary leftover from when humans had more body hair.
The reflex makes body hairs stand up, which used to trap a layer of warm air for insulation or make our ancestors…
Humans are the only animals that have chins.
Even our closest primate relatives, like chimpanzees and Neanderthals, lack a protruding chin. Scientists believe it…
The human appendix is not a useless organ; it stores good bacteria.
Known as a 'safe house', the appendix protects beneficial gut bacteria. After an illness like diarrhea, it helps…
The fastest muscle in the human body is the eye muscle.
The extraocular muscles can dart the eye back and forth in just milliseconds, allowing us to track fast-moving…
The left lung is smaller than the right lung to make room for the heart.
Because the heart is slightly tilted to the left side of the chest, the left lung has only two lobes, while the right…
The human body is made up of about 7 octillion atoms.
This incredibly massive number (7 followed by 27 zeros) highlights the sheer microscopic complexity and scale of…
It takes your body roughly 12 to 24 hours to completely digest a meal.
After you eat, food travels through the stomach and small intestine, eventually moving to the large intestine where…
The heart generates its own electricity.
The heart beats thanks to electrical impulses generated by the heart itself. This means that, even outside the body…
Fingerprints form at three months of gestation.
The unique patterns of fingerprints begin to develop in the fetus around the 10th week of pregnancy and remain the…
The human brain stops growing in size around age 18, but continues to develop and mature until the mid-20s.
The prefrontal cortex, responsible for decision-making, impulse control, and planning, is one of the last areas of…
The mesentery was reclassified as an organ in 2016.
The mesentery is a fold of tissue that connects the intestines to the abdominal wall. For centuries it was considered…
Dua's layer in the human eye was only discovered in 2013.
Dua's layer is a structure about 15 micrometres thick in the cornea. It is very strong and impervious to air…
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…
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…
