Is it really not the heat, but the humidity? With temperatures spiking around the world, it's a good time to answer some questions about the heat index.

BIG QUESTIONS
Yes, they’re synonyms. But there’s a little more to the semantic story of ‘recur’ vs. ’reoccur’ than that.
The woman known as "Jane Roe" left an enormous mark on the nation’s political landscape—one that’s still at the fore a half-century later.
‘Chicken’ is such a common synonym for ‘coward’ that it probably doesn’t even seem weird. But it is.
It's a warning put out by waitstaff and parents everywhere. But what does 'piping' have to do with it?
Truck signage highlights the dangers of right turns over left turns for a good reason.
According to Guinness World Records, Marilyn vos Savant's IQ of 228 is the highest ever recorded.
Your credit card probably has a return address in Delaware. That's because the second smallest state in the country has some of the biggest corporate perks.
Infants are typically born with 52 teeth, but it’s not an even split between baby teeth and adult teeth.
You might think your cat puts toys in his water bowl just to be a jerk. We can’t exactly prove that wrong—but there might be another explanation.
The plastic arrows on the wheels of trucks and buses serve an important purpose.
It may have something to do with Julius Caesar, but the story isn’t that straightforward.
Modern guidebooks offer nearly a dozen different explanations for why Brussels' 'Mannekin Pis' statue is relieving himself.
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.
Diners love to highlight their blue plate special. But what's so special about it?
The meaning of your fever dream is probably just this: You have a fever.