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Why pollen makes you sneeze

If you're allergic to pollen, your immune system mistakes it for a threat and releases histamine. That makes you sneeze in an effort to flush the grains out.
Why pollen makes you sneeze
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How much skin, blood, and saliva humans produce in a lifetime

The human body can replace 20 million cells in just a few seconds, which means over a lifetime, your body produces a lot of hair, blood, saliva, and skin. Our bodies shed a whole layer of outer skin every two to four weeks. Your liver can regenerate itself – sort […]
How much skin, blood, and saliva humans produce in a lifetime
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What happens to an astronaut’s body in space

Space is a dangerous and unfriendly place not suited for human life, yet astronauts are sent up to the International Space Station every year. From exposure to high levels of radiation to surviving in micro-gravity conditions, space can be a tough place to live. Without gravity working on your body, […]
What happens to an astronaut’s body in space
News

Why organ transplants are so expensive in the US

The average billed cost of a heart transplant is an estimated $US1,382,400, according to consulting firm Milliman, and other organs aren’t much cheaper. Doctors say transplant centres are strong revenue sources for hospitals; they charge high service fees, which factor into the overall cost, to help meet their bottom line. […]
Why organ transplants are so expensive in the US
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What happens to the human body after 100 years inside a coffin

Your brain is one of the first parts of your body to break down. Just a few minutes after death, its cells collapse and release water. Then other energy-guzzling organs follow. That night, microbes eat through your gut and escape into the rest of your body. They release toxic gases […]
What happens to the human body after 100 years inside a coffin
News

Why pollen makes you sneeze

Each year, 26 million Americans experience allergies, sometimes nicknamed hay fever. When trees, weeds, and grasses want to mate, they release thousands of pollen grains into the air – which can end up entering your lungs, eyes, and nose. Special antibodies attach to the grains and summon immune cells to […]
Why pollen makes you sneeze
News

Why men get beer bellies

Beer bellies aren’t exclusive to beer drinkers. It has more to do with the way our bodies store up fat. While women tend to store fat in their thighs, arms, and backside, men tend to do so in their bellies. Visceral fat pushes a man’s abdominal wall outward, creating a […]
Why men get beer bellies
News

Why stubbing your toe hurts so much

Stubbing your toe hurts so much because you’re slamming a tiny surface with a force equal to 2-3 times your bodyweight. Then a bundle of nerve endings called nociceptors fire a danger signal to your brain. Although it’s not pleasant, this pain might have helped your ancestors step carefully and […]
Why stubbing your toe hurts so much
News

The toilet isn’t the dirtiest place in your home

Around 200,000 different species of bug, bacteria, and fungus live in your house. You may think most of them live in your toilet, but that’s not true. Some fungi live in your air conditioner and get blasted throughout the house. One kind of mycobacteria lives in your showerhead and has […]
The toilet isn’t the dirtiest place in your home
News

Living in outer space can cause these 9 weird changes to your body

NASA and companies like SpaceX and Boeing are looking to the moon and Mars as exciting targets for astronaut exploration, if not permanent colonization. However, we’re only just beginning to understand what long-term life in space can do to human bodies. Much of what scientists are learning comes from NASA’s […]
Living in outer space can cause these 9 weird changes to your body
Video

A neuroscientist explains why reality may just be a hallucination

Anil Seth, professor of Cognitive and Computational Neuroscience at the University of Sussex, explains the link between perception and reality. Seth believes reality as we know it comes from activity of our brain. Following is a transcript of the video. Anil Seth: How do we know that we experience the […]
A neuroscientist explains why reality may just be a hallucination