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

MF EXPLAINS IT ALL
Save your nap for the cruising portion of your flight.
A very, very specific set of standards can keep books from falling apart. But it's usually too expensive for consumers.
Don't worry: It's not because sirens hurt dogs’ sensitive ears.
The literal meaning of ‘sic’ is ‘so’ or ‘thus.’ But the way writers use it is a little more nuanced.
Here’s something else to stress about for Thanksgiving.
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.
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.
We look back at the history of Thanksgiving to explain how turkey, cranberry sauce, and pumpkin pie got on your plate.
They’re quintessential starter pets for young children. But it’s important to know how to properly care for a pet goldfish.
Climate can cause a big difference in how much hair a lion grows.
Pigeons aren’t known to be particularly talkative birds.
The loose flesh that hangs from a turkey’s neck isn’t the most attractive part of the bird—to humans, at least.
To keep porta potties (relatively) clean, sanitation workers require special equipment and a strong stomach.
When it comes to superstitions about bad luck, indoor umbrellas are right up there with broken mirrors and black cats.