The plastic arrows on the wheels of trucks and buses serve an important purpose.

BIG QUESTIONS
Answering “When is Pride Month?” takes one word: June. Why it’s June, on the other hand, is more of a short story.
The difference between light and dark brown sugar boils down to one simple factor: molasses content.
Voyeuristic scientists discovered a “golden” rule when it comes to how—and for how long—animals urinate.
It's not a satellite, it's not GPS, and it's not a camera.
White and black pepper both start as berries from the same plant.
The specifics of each EMS job vary by state—but the job titles aren’t interchangeable.
It's a favorite accessory of doctors in movies, television, and Spirit Halloween stores. But what does it do?
What causes a runny nose? Spicy foods, cold weather, and—strangely—crying. Here’s why.
If you need a rice vinegar substitute, reach for the rice wine vinegar—not the rice wine.
The sight of a red fire truck will catch your eye, but it's not the reason emergency vehicles are painted scarlet.
The overplayed song has scorched the ears of many a guitar store employee. But can they legally ask you to stop playing it?
The high-speed patter of the auctioneer is called 'the chant,' and it's designed to separate bidders from their money.
If you've been using the terms pretty much interchangeably, you're technically wrong. But you're not alone.
Newer car models make it obvious when you're due for an oil change.
When discussing Marilyn's measurements, you have to take vintage clothing sizes into account.
Though they differ in taste and appearance, white asparagus and green asparagus are the same plant species.
Bowling shoes aren't top-line kicks, but they do more to keep you safe than you might think.
The silhouette on the NBA logo—a player dribbling and swiveling between a red and blue background—is Lakers legend Jerry West. But how does he benefit, if at all?