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Why Haven't All Primates Evolved into Humans? Humans did not evolve from apes, gorillas or chimps. We are all modern species that have followed different evolutionary paths.
Who was Saint Valentine? Valentine’s Day can be traced back centuries to a patron saint. Sweetheart cards, “conversation” hearts, and flowers also have dated origins.
Why Do Soft Drinks Go Flat? When you pop the top, the pressure inside the can decreases, causing the CO2 to convert to gas and escape in bubbles.
Do Subliminal Messages Really Work? Scientists still debate this one, but at least we know something about how it's supposed to work.
How Long is a Day on Saturn? Nobody knows, and in reality no answer will ever fully suffice. The length of Earth's day has a solid answer, on the other hand. Sort of.
Is House Dust Mostly Dead Skin? There are far more common sources of dust pollutants, including animal dander, sand, insect waste, flour (in the kitchen), and of course lots of good, old-fashioned dirt.
Why Do We Grind Our Teeth? Bruxism sounds like a radical political philosophy, but here the proletariat is the citizenry of your mouth, being ground down by an oppressive reflex of the jaw.
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.
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