Mysteries Archive
09 June 2014, 06:40 PM ET
Why is the sky blue? The light coming from the sun is made of many colors, each of which has a different wavelength.
14 May 2014, 04:58 PM ET
Today, on National Buttermilk Biscuit Day (May 14), a lot of people may be wondering, what exactly is buttermilk?
12 May 2014, 05:01 PM ET
Tornadoes are one of the most destructive natural forces on Earth. Though scientists don't entirely understand how tornadoes form, they do have a good idea about the conditions that cause tornadoes to develop.
12 May 2014, 04:17 PM ET
Contrary to what their name would suggest, sweetbreads are not sugary pastries. So, what are sweetbreads?
12 May 2014, 03:20 PM ET
Turtles, like the humans who love them, are a diverse bunch. There are over 300 species of this ancient reptile, and each one has its own preferred diet.
08 May 2014, 04:43 PM ET
It's proven that the caffeine in coffee stimulates the brain, but there's something in a cup of joe that can also jump-start the other end of the body. That's right: Coffee can make you poop.
08 May 2014, 03:17 PM ET
For pet cats, all the toys in the world can't compare to a simple cardboard box.
29 April 2014, 06:00 PM ET
Kosher food is not a style of cooking or a cultural menu (like Chinese or Italian food). Instead, "kosher" refers to foods that adhere to the dietary laws of Judaism, also called kashrut, as described in the Torah.
28 April 2014, 04:34 PM ET
It's commonly believed that dogs wag their tails to convey that they are happy and friendly, but this isn't exactly true.
28 April 2014, 03:33 PM ET
A contusion, or bruise, is a reddish-purple discoloration of the skin that doesn't blanch, or turn white or pale, when pressed upon.
28 April 2014, 03:26 PM ET
One of the fastest-growing sources of energy in the world, wind turbines generate electricity without emitting greenhouse gases into the environment (unlike fossil fuels).
26 April 2014, 08:52 AM ET
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
26 April 2014, 08:48 AM ET
A byproduct of the metabolic breakdown of purines, uric acid is a human waste product that most people never think about.
14 April 2014, 04:53 PM ET
For humans, touch is a sense most often associated with the fingers. But man's best friend, the dog, touches the world a different way — with his face.
14 April 2014, 04:17 PM ET
Dolphins sleep with one eye open, and with half their brain wide awake, researchers have found.
14 April 2014, 03:43 PM ET
Found in the bark of the cinchona tree, quinine is a compound with many medicinal applications, including fever-reducing, painkilling and anti-inflammatory properties. It was also the first treatment for malaria.
11 April 2014, 03:19 PM ET
When the sun heats water in the oceans, rivers, lakes and other sources, some of it evaporates, or transforms from liquid water to water vapor. This is the first step in cloud formation.
11 April 2014, 02:50 PM ET
If you've ever had a tooth pulled, then you might be familiar with a severely painful — and aptly named — condition known as dry socket (alveolar osteitis).
11 April 2014, 12:33 PM ET
The FTC estimates that 9 million Americans have their identity stolen every year in credit-card skimming or similar kinds of scams. The ease with which skimmers operate, however, raises several questions about the security of card transactions.
09 April 2014, 03:20 PM ET
Xanthan gum helps salad dressing pour easily from the bottle, makes ice cream taste creamier and allows liquid cosmetics to stay blended while on the shelf.
31 March 2014, 04:52 PM ET
Despite their name and appearance, peanuts are not tree nuts like walnuts and pecans — they're part of the legume family of plants, which includes beans, lentils, peas and other familiar foods.
31 March 2014, 04:30 PM ET
Contrary to what some people think, pineapples don't grow on trees — they grow out of the ground, from a leafy plant.
31 March 2014, 04:07 PM ET
Blood sugar, or glucose, is an important source of energy and provides nutrients to your body's organs, muscles and nervous system.
31 March 2014, 01:19 PM ET
Itchy, contagious and in a place you'd rather not mention, jock itch (tinea cruris) is a fungal skin infection that affects the genital region.
27 March 2014, 05:34 PM ET
Peripheral neuropathy (often referred to simply as "neuropathy") refers to any condition that damages or disrupts nerves in the peripheral nervous system.
27 March 2014, 05:08 PM ET
What smells like beer, tastes like carbonated vinegar and looks like something you forgot in the back of the refrigerator? Why, kombucha tea, of course!
25 March 2014, 04:36 PM ET
Ketosis is a temporary physical condition marked by elevated levels of compounds known as ketone bodies in the body's tissues and fluids.
25 March 2014, 03:56 PM ET
Sneezing — or as it's known in the medical community, sternutation — occurs when the respiratory epithelium that lines the nose is irritated.
24 March 2014, 05:15 PM ET
More than two weeks after its strange disappearance, Malaysian officials announced they believe Flight 370 crashed into the sea.
19 March 2014, 03:42 PM ET
It's commonly believed that the ocean is blue because it's reflecting the blue sky. But this is a misconception.
19 March 2014, 02:16 PM ET
In 1929, bacteriologist Alexander Fleming discovered the first true antibiotic, penicillin, ushering in a new age of medicine. Since then, scientists have found dozens of antibiotics, which fight bacteria in a variety of ways.
19 March 2014, 11:53 AM ET
Men might grow a mustache just for extra style points, but the facial hair of the cat has nothing to do with fashion. Whiskers are highly sensitive tactile hairs that grow in ordered patterns on a cat's muzzle, above its eyes, and elsewhere on its body.
19 March 2014, 09:15 AM ET
While celebrities and models may sport pearly white teeth, the smiles of most people are a tad duller. But this shouldn't be too surprising: A number of different things can affect the color of your teeth and turn them that dreaded yellow hue.
18 March 2014, 02:22 PM ET
The discovery of ripples in space-time from the mysterious earliest moments after the Big Bang is not only a "smoking gun" for the universe's rapid expansion but also could have important implications for physics.
13 March 2014, 11:42 AM ET
You've probably heard it all your life: Eating sweets will rot your teeth. But while a diet high in sugar certainly promotes the formation of cavities (as well as other medical problems), sugar itself isn't the real culprit behind tooth decay.
27 February 2014, 04:38 PM ET
Jet lag results from disruptions to the body's "clock" or natural, circadian rhythms. This internal clock — which runs on an average 24.1-hour schedule — controls sleep, wakefulness and a host of other physiological processes.