Mental Floss

BIG QUESTIONS

Not something a driver wants to see in their rear-view mirror.

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.

Alexia Kontolemos
Library binding is the best way to keep books in circulation.

A very, very specific set of standards can keep books from falling apart. But it's usually too expensive for consumers.

Jake Rossen








(It might have something to do with sick days.)

The day after Thanksgiving, one of the busiest shopping days of the year, has a rather sinister label: Black Friday. How did that happen?

Jake Rossen








There’s no doubt about it—rotting food is gross.

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.

Arika Okrent


Mark your calendars!

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.

Erin McCarthy






Cleaning a porta potty is no walk in the park.

To keep porta potties (relatively) clean, sanitation workers require special equipment and a strong stomach.

Michele Debczak