One of the most in-demand household items is now scarce. If you find an old and expired bottle, here's what you should know about its effectiveness.

BIG QUESTIONS
The story of March Madness has everything: Chaucer, sex-crazed hares, Alice in Wonderland, lawsuits, and a basketball coach-turned-poet from Illinois.
Knowing your equines is no mere horseplay. Here's how to tell the difference between horses, ponies, and even miniature horses.
Paperbacks are more popular with readers, but they're rarely the first version of a book that gets published.
Primary elections help us decide which presidential candidates will compete in the general election, but the processes vary by state.
In lieu of hanging shower curtains or providing full shower doors, many newer hotels are opting for glass panels that cover only half the length of the shower. Why?
No need to jaywalk—your crosswalk signal will appear eventually. But it might not be because you pressed the button.
The transaction receipt printed off by the chain pharmacy CVS can exceed the height of an adult. What are they thinking?
Happy leap year! You can thank Julius Caesar and his buddies for bringing them to Europe more than 2000 years ago.
Chocolates have become the default Valentine’s Day gift, but the treat didn't earn its romantic reputation overnight.
Ash Wednesday's surprisingly eco-friendly ash stash comes from another Christian observance known as Palm Sunday.
The Iowa caucus doesn’t always predict the presidential nominee, but it’s been an important part of the process since the 1970s.
The two real estate professionals are often confused for one another, but there are some significant differences that prospective homebuyers should know about.
If you're an adult, the accent you use to speak now is likely the accent you'll have for the rest of your life.
The popularity of the surname McCoy makes it difficult to pinpoint one origin on the phrase, but here are the leading theories.
Seeing your breath isn't a cold weather phenomenon. It can also be visible when it's as warm as 60°F outside!
Nobody can seem to agree on whether the new decade began on January 1, 2020, or if it actually begins on January 1, 2021.
Lava lamp creators are notoriously tight-lipped about their secret ingredients, but DIY lava lamps aren’t impossible.
There's ancient evidence for the custom of shaking hands, but did it mean the same thing then as it does today?
Getting grocery and convenience store items for $1 may seem like a good deal, but dollar stores use some tricky practices to keep profits high.
There's nothing better than a warm chocolate chip cookie. But how do the chips seemingly resist oven temperatures?
Political cartoonist Thomas Nast came up with his own answer to the “Where does Santa live?” question ... and it stuck.