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?
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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.
Where is Stonehenge, who built the prehistoric monument, and how?
The prehistoric monument Stonehenge was built up to 5,000 years ago on Salisbury Plain in England, but its ultimate purpose remains a tantalizing mystery.
What's the largest muscle in the body, and the smallest?
Several muscles could be called the "largest" in the body, depending on whether you're talking mass or surface area, but the body's smallest muscle has no competition.
States of matter: Definition and phases of change
Reference The four fundamental states of matter are solid, liquid, gas and plasma, but there others, such as Bose-Einstein condensates and time crystals, that are man-made.
Why do freckles come out in the sun?
Freckles can reappear or become darker after sun exposure and then fade in less-sunny seasons.
Why do you get dizzy if you stand up too fast?
It's normal for you to occasionally get dizzy and for your vision to go dark when you stand up, but it can sometimes be a sign of a chronic health condition.
Superbugs are on the rise. How can we prevent antibiotics from becoming obsolete?
Improving our "stewardship" of antibiotics is key to preventing bacteria from gaining resistance to the essential drugs.
What causes a 'nervous stomach'?
Stress can cause "nervous stomach," but what is the link between negative emotions and uncomfortable digestive symptoms?
Why are some people's veins 'hard to find'?
From stress to dehydration, there are many reasons why some people's veins may be "hard to find" when they're getting an infusion or blood draw.
How does water get stuck in your ear — and how do you get it out?
Whether it's from a day at the beach or a trip to the swimming pool, getting water stuck in your ear is very common. But how does it happen?
What is pareidolia?
Pareidolia is the phenomenon in which people see faces or other patterns in ambiguous images, such as Jesus on toast or the man in the moon.
How many planets are in the universe?
We currently know of 5,502 planets beyond the solar system, but we've only found the tiniest fraction of the planets astronomers think lie elsewhere in the universe.
How do some people survive falls from great heights?
Surviving a fall from a great height is medically improbable, but not impossible. How do some people survive?
What is the most colorful animal on Earth?
Neon green, ultraviolet, rainbows — the variety of colors animals can make seem endless.
What are the most polluted cities in the world?
Cities like Lahore, Pakistan, Hotan China and Delhi, India have consistently poor air quality, but it's impossible to accurately identify the city with the world's worst air pollution.
