Watch What Happens to Magnetic Objects Inside an MRI Machine

Anyone who’s gotten an MRI scan knows that bringing metal into the machine would be a bad move. That’s because the process, short for magnetic resonance imaging, uses a large magnet and radio waves to scan the organs inside your body. Patients must be screened before entering the room to ensure they're not carrying any objects that might react to the machine. But what would happen if something magnetic did make it inside?

This video from UC Berkeley’s “practiCal FMRI” demonstrates exactly that. Before an MRI machine was decommissioned, a group scientists decide to conduct some fun experiments with it. The clip shows a steel shackle being bounced around by the force of the 4 Tesla magnet, and a stapler banging against its walls until it comes apart. When they position a chair with magnetic wheels near the entrance of machine, it’s pulled towards it with a force that reaches 2000 pounds. If you’ve ever wondered why they don’t allow metal objects into the MRI room, this should give you a pretty clear idea.

All images via YouTube.

© 2017 USPS
Pop Culture
Speedy Delivery: Mister Rogers Will Get His Own Stamp in 2018
© 2017 USPS
© 2017 USPS

USPS 2018 Mister Rogers stamp
© 2017 USPS

After weeks of mailing out this year’s holiday cards, postage might be the last thing you want to think about. But the U.S. Postal Service has just given us a sneak peek at the many iconic people, places, and things that will be commemorated with their own stamps in 2018, and one in particular has us excited to send out a few birthday cards: Mister Rogers.

In celebration of the 50th anniversary of Mister Rogers’ Neighborhood, Fred Rogers’s groundbreaking PBS series that the USPS says “inspired and educated young viewers with warmth, sensitivity, and honesty,” the mail service shared a mockup of what the final stamp may look like. On it, Rogers—decked out in one of his trademark colorful cardigans (all of which were hand-knitted by his mom, by the way)—smiles for the camera alongside King Friday XIII, ruler of the Neighborhood of Make-Believe.

Though no official release date for Fred’s forever stamp has been given, Mister Rogers is just one of many legendary figures whose visages will grace a piece of postage in 2018. Singer/activist Lena Horne will be the 41st figure to appear as part of the USPS’s Black Heritage series, while former Beatle John Lennon will be the face of the newest Music Icons collection. Sally Ride, the first American woman in space, will also be honored.

Can You Spot the Christmas Pudding?

Whether it’s a sheep hanging out with Santa Claus or a panda bear hiding among some snowmen, regular Mental Floss readers know that hidden picture brainteasers are one of our favorite things. And the optical experts at have released a delicious one, just in time for Christmas. Somewhere in the midst of all these holiday-themed goodies above, there’s a holiday pudding just waiting to be discovered. Can you spot it? Your time starts … now.

If you give up, or are the kind of person who reads the last page of a book before the first one and just wants to know the answer, scroll down to see where it’s hiding.



More from mental floss studios