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How Do Oysters Make Pearls? An oyster forms pearls by secreting a mineral substance called nacre and uses it to quarantine an irritant.
Why Do Men Go Bald? The fact that one can be genetically predisposed to baldness suggests that losing one's hair has (or had) some evolutionary advantage.
What are Eyelashes For? Eyelashes protect the eye from foreign particles and act as sensors to let the brain know a potentially painful poking could be imminent.
Why are Planets Round? Well, they're not! But let's pretend they are for a moment. Here's how it works:
Bison vs. Buffalo: What's the Difference? Early American settlers called bison "bufello" due to the similar appearance between the two animals.
What's a Penny Made Of? A penny is not what you think. Indeed, from 1783 to 1837, a cent was pure copper. But newer pennies are have a much different composition.
Do Eskimos Really Have 400 Words for Snow? Anyone who suffers routine heavy snowfalls probably has a few choice words for snow. But 400?
Does Stretching Really Prevent Injury? Stretching before exercise sounds like a good idea, but in fact there is little or no benefit to it.
Why is Grass Green? Like many plants, most species of grass produce a bright pigment called chlorophyll.
Why is Cow's Milk White? A combination of calcium-rich casein and certain fats give bovine juice its color.
How Do Snowflakes Form? Snowflakes are mostly unique because of their complex creation, involving chemical reactions and changing temperatures.
What is 20/20 Vision? 20/20 vision means your eye can see what the average human eye sees clearly at 20 feet.
Will an Asteroid Hit Earth? Are We All Doomed? This is the question we get most often around here, in one form or another. Often it comes from someone who is really, really worried.
What is Whiplash? The head's jerking action (not to be confused with the jerk who rear-ended you) pulls muscles and ligaments beyond their typical range of motion, causing fibers to tear.
How Should I Treat a Cold? The average adult has two to four colds a year. Children get up to 10. Among the remedies ... yes, chicken soup.
Why Do We Sleep? Theories abound, but much of our need for sleep remains a mystery.
What Triggers an Avalanche? The typical avalanche, traveling at 80 mph, is anything but fluffy and rarely triggered by noise.
How Do Snakes Swallow Large Animals? A snake's jaw is rigged with tendons, muscles, and ligaments that give it a gymnast's flexibility. The jaws do not dislocate, however.
Is Antibacterial Soap Really Necessary? Beyond easing your mind, the more expensive products will indeed clean your hands if you use them right, but plain old soap and water is still a good way to go.
How Many Muscles Does a Human Have? Muscular tissue makes up 35-40 percent of our body weight and comes in several types of packages-skeletal, cardiac and smooth.
How Does Squinting Help Us See? Squinting squishes the eyeball slightly to correct for a focus point that misses the mark.
Why Do We Snore? Vibrating throat muscles are responsible for snoring.
What Was the First Museum? The history of the public museum.
How Does an Etch A Sketch Sketch? The secret behind the Etch A Sketch invention.
Why Does Pain Make People Scream? Non-verbal communication and the purpose of pain vocalizations.
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