We often use ‘eldest’ and ‘oldest’ interchangeably, but the words shouldn’t be swapped out so easily. Here's how to use each.

BIG QUESTIONS
A home on Sesame Street may have been affordable when the show premiered, but that's no longer the case.
A professional dog trainer explains the instinctual reason driving the behavior and offers some expert advice on how to stop your dog from chasing cars.
A very, very specific set of standards can keep books from falling apart. But it's usually too expensive for consumers.
The tradition of giving misbehaving children lumps of coal predates the Santa Claus we know and love today.
Olive Garden makes good on its promise of unlimited breadsticks, but the deal does come with some unpublicized caveats.
The day after Thanksgiving, one of the busiest shopping days of the year, has a rather sinister label: Black Friday. How did that happen?
The Guinness World Record holder for longest song ever is based on a 16th-century Indian poem.
You can, but the USPS actually prefers that you don’t. Here’s why.
Before you talk turkey this Thanksgiving, find out what we know about the phrase’s meaning and origins.
Those frilly paper caps on your turkey's legs have been called “turkey frills,” “turkey booties,” and even “turkey panties.” Here’s where they came from.
Dropping that ‘t’ sound is an example of what linguists call glottalization, or replacing a sound with a pause in the vocal cords.
Solariums are nostalgic for many customers, but Wendy's thinks they’re dated.
The word ‘gross,’ which came to English from French, took on a variety of senses in English related to size. But the ‘gross of today is different from the ‘gross’ of the past thanks to teens.
Ever wondered if yams and sweet potatoes are the same thing? Read this before sitting down to Thanksgiving dinner.
The word predates social media.
There are a few reasons—including a little something to do with the horse and buggy. Find out more about the history of Election Day.
The "Ty" on the iconic heart-shaped Beanie Babies tag isn't an abbreviation. It's the name of the toy brand and its notorious founder.
Climate can cause a big difference in how much hair a lion grows.