BIG QUESTIONS

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Why Are Blueprints Blue?

Photo Courtesy of the Free Library of PhiladelphiaTechnical drawings of architectural or engineering designs always seem to consist of white images and text on blue paper. Why?

How Do Tongue Twisters Twist The Tongue?

Try and say “she sells sea shells by the sea shore” three times very fast. The first time might go alright, but on the second or third go-round, chances are the words start to degrade as you’re saying them, falling apart in your mouth like a crumbling Jen

Is It True That T. Rex Could Only See Things That Were Moving?

I rewatched Jurassic Park a few weeks ago and, from the story to the special effects, it still holds up. But I’ve been nagged by one thing that’s stuck with me from the first time I saw the movie...

Why Do We Crave Chocolate?

If you’re like most people, you simply can’t pass up the opportunity to partake in a piece of chocolate (or five).

How & Why Do Leaves Change Color?

Despite their astonishing record of losses when dealing with lumberjacks and beavers, trees are pretty tough customers. Their trunks, branches, roots and twigs are all more than capable of enduring a winter's worth of freezing temperatures, snow, sleet an

Why Did the U.S. Abandon the Gold Standard?

Some have called for a return to the gold standard. What does the phrase actually mean, and how would it affect the economy?

Does Eating Celery Really Result in Negative Calories?

Snake oil salesmen all over the web would have you believe that, for a few easy payments, they'll reveal to you a diet focused on “negative calorie” foods.

Was Manhattan Really Bought for $24?

One of the most persistent myths in American history is that European explorers really got one over on the Native Americans by purchasing the entire island of Manhattan—where property has averaged $1000+ per square foot over the last few years—for a measl

Are Carrots Really That Good For Your Eyes?

When I was a kid, my parents often tried to sell me on the idea that carrots were good for my eyes—and if I wanted to avoid vision correction in the future, I would eat them now. But after I was fitted for my first pair of glasses in fourth grade, they dr

Why Do We Have Fingerprints?

Though fingerprints are handy for identifying perps, biologically, scientists still aren't quite sure what our fingerprints are for. But as they test different hypotheses, they're getting closer to the answer—and learning some pretty cool stuff in the pro

Why Are First-Year Students Called Freshmen?

Image credit: Duke.eduThere was a time when almost every university student was a sophomore. Well, a sophister, to be exact, but that’s where the word “sophomore” originated. A sophist was a wise man (derived from the Greek word sophos), so when Henry VI

Why Are Bottles of Champagne Smashed On New Ships?

Before a ship slides from its berth into the water, it must first get hit on—by a bottle of booze, usually champagne. Here’s the lowdown on the history and physics of smashing some bubbly and launching a ship

Why Is it so Hard for Pandas to Get Pregnant?

In the wild, giant panda mating occurs just as nature specials would have you believe. There’s intense competition for each female, and the dominant male will mate with her several times to ensure success. And that strategy works: Wild female pandas gener

Did Blowing into Nintendo Cartridges Really Help?

When I was a kid with a Nintendo Entertainment System (NES), sometimes my games wouldn't load. But I, like all kids, knew the secret: take out the game cartridge, blow on the contacts, and put it back in. And it seemed to work. (When it failed, I'd ju

Naked and Nude: What's the Difference?

Technically speaking, naked implies that a person is unprotected or vulnerable. It also describes something that is unadorned or without embellishment, as in the oft-mentioned naked truth. Nude, on the other hand, means one thing: unclothed.Think of it

What Does a U.S. Ambassador Do?

Christopher Stevens, the U.S. Ambassador to Libya, was killed last night along with three other Americans when an Islamist mob stormed the American Consulate in Benghazi. With the tragic story all over the news today, reader Kimberly wrote to ask what, ex

Why Can You Taste Your Eye Drops?

A friend of mine recently got pinkeye. Whenever she put in her eye drops, she noticed a distinct and very unpleasant taste on the back of her tongue.

Why Do So Many Countries End in "-stan"?

Who put the bomp in the bomp bah bomp bah bomp? Who put the -stan in Afghanistan? I don’t know about the former, but we can thank the Proto-Indo-Europeans for the latter.

What's the Song That Clock Chimes Play?

Readers Meg, Wayne, and Rajiv all wrote in to ask about the tune that clock chimes typically play. What’s it called? Where did it come from? How’d it get so popular? Here’s the story.http://youtu.be/2mfBkd7MAdMIn 1793, a new clock was installed at St Mary

Why Does Bad Weather Aggravate Old Injuries?

Reader Jen wrote in to ask, “Why do old injuries ache during crummy ache during crummy weather?" The idea that certain aches and pains correspond with, and can even predict, the weather is widespread, and has been around since at least the days of ancient

What Are "Dibs"?

Everyone wants dibs (such as “I’ve got dibs on that last piece of pizza!”) but do we know what they are or why we call them? Chances are you first started calling dibs back when you were a kid on the playground. Coincidentally, the playground is exactly

How Secure Are Electronic Voting Machines?

It’s not that the machines have slight security glitches. It’s more that they’re almost comically hacker-friendly. Take the touchscreen Diebold Accuvote system. In 2012, nearly one-quarter of Americans are expected to use them to cast ballots. But the mac

Why Do Moths Eat Clothes?

They don’t, technically. It’s actually their larvae, or caterpillars, that eat clothes, not the adult moths.It’s only a relatively small group of moths, the family Tineidae, that have any interest in your clothing. Throughout much of the US, you’ll only f

Why Do Crabs and Lobsters Turn Red When You Cook Them?

While they might be bright red when they hit your dinner plate, crabs and lobsters are usually brown, olive-green or gray when alive and in the wild (at least in the mid-Atlantic U.S.; crustaceans farther south come in a variety of vibrant colors).

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