Latest articles by Anna Gora
How long can the brain survive without oxygen?
When the brain's supply of oxygen is reduced or eliminated, damage can set in very quickly.
Why is it called 'morning sickness' if it can happen any time of day?
Pregnancy sickness can happen at any time of day or night, but its symptoms can often be worse in the morning.
Why is snot sticky?
The glue-like mucus in your nose plays an important role in your immune system.
What causes bruising?
Bruises are essentially pooled blood under the skin that changes color as its components break down.
Why do wrinkles form?
Wrinkles are caused by a loss of structural components in the skin, but what drives this process?
Do ears and noses get bigger with age?
Ears and noses do increase in size as we get older, but it's due to how aging affects our tissues, rather than the growth of new tissue.
Why do lips get so chapped in winter?
The reason your lips get chapped in cold weather lies in their unique anatomy.
Can drinking alcohol really cause hiccups?
"Drunk hiccups" seem to be a real phenomenon, rather than just a gag in classic cartoons, but we know surprisingly little about what actually causes them.
Why is pink eye so contagious?
The answer to this question depends on two factors: the microbes that cause the infection and the way they spread from person to person.
Can you really be allergic to the sun?
A number of medical conditions can cause an allergic reaction to ultraviolet light from the sun.
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Does it really take 20 minutes to realize you're full?
There's a time gap between when you've eaten enough to satisfy your hunger and when the brain actually realizes that you are full. Why?
The camera we called a 'cheat code' for wildlife photography is $500 off in the Black Friday sale
Deals Whether you're capturing wildlife or shooting the stars, the Canon EOS R5 is a great camera for serious snappers and with $500 off, it's a bargain too.
What causes spotting between periods?
There are a number of possible reasons for bleeding between periods, including hormonal changes, infections and certain medical conditions.
What causes metal allergies?
The symptoms of a metal allergy can vary in severity, but why do they happen?
How does plaque cause cavities?
A buildup of dental plaque breaks down tooth enamel, leading to tooth decay, gum disease and other oral health conditions.
What does it look like when your sinuses are clogged?
Having a stuffy nose often comes with pain and tenderness around your cheeks, eyes or forehead. But what do blocked sinuses look like inside your head?
Why is it hard to hear when you have a cold?
Coming down with a cold or the flu can muffle your hearing, but why?
What is a heart murmur?
Heart murmurs are extra, unusual sounds heard during a heartbeat — but why do they happen?
Why do beets turn your poop and pee red?
After you've eaten beets, your poop and urine can take on a shocking red or pink color — but why?
How long does it take to digest food?
The speed at which food moves through the digestive tract depends on many factors.
