shoe

As he watched the Boston Celtics play from the stands of TD Garden, one noise kept catching Adel Djellouli’s ear.

“This squeaking sound when players are sliding on the floor is omnipresent,” he said. “It’s always there, right?”

Squeaky shoes are part of the symphony of a basketball game, when rubber soles rasp against the hardwood floors as players jab step, cut and pivot and defenders move their feet to stay in front of their assignment.

Returning home from the game, Djellouli wondered how that sound was produced. And as a materials scientist at Harvard University, he had a way to find out.

Djellouli and colleagues slid a sneaker against a smooth glass plate over and over. They recorded the squeaks with a microphone and filmed the whole thing with a high-speed camera to see what was happening under the shoe.

In a study published Wednesday in the journal Nature, they described what they found. As the shoe works hard to keep its grip, tiny sections of the sole change shape as they momentarily lose then regain contact with the floor thousands of times per second — at a frequency that matches the pitch of the loud squeak we hear.

“That squeaking is basically your shoe rippling, or creating wrinkles that travel super fast. They repeat at a high frequency, and this is why you get that squeaky noise,” Djellouli said.

The grip patterns on the soles may also play a role. When researchers slid blocks of flat, featureless rubber against the glass, they saw a series of chaotic, disorganized ripples but didn’t hear squeaks.

The ridge-like designs on the bottom of your shoes may organize the bursts to produce a clear, high-pitched sound.

Other researchers have studied these kinds of bursts before, but this sneaker study examines friction happening at much faster speeds. And for the first time, it links the speedy pulses with the squeaking sound they produce.

These insights don’t just serve to satisfy the curiosity of a basketball fan. They could also help answer important practical questions. “Friction is one of the oldest and most intricate problems in physics,” wrote physicist Bart Weber in an editorial accompanying the new research. Yet, despite its practical importance, he wrote, “it is difficult to predict and control.”

Understanding friction better could help scientists better understand how the Earth’s tectonic plates slide and grind during earthquakes, for example, or to save energy by reducing friction and wear.

It could also help eliminate moments off the court when squeaky shoes can be a little awkward or embarrassing, such as in a quiet office hallway.

This research doesn’t offer a fix, though the internet has plenty of advice that may be risky, including rubbing soap or a dryer sheet on the soles. But some of the insights from the study could help to design squeak-free shoes in the future.

For example, one additional experiment found that changing the thickness of the rubber could make the squeak sound lower or higher in pitch. In the future, could we fine-tune our shoes to squeak in a pitch so high we can’t even hear it?

“We can now start designing for it,” said Weber, who is with the Advanced Research Center for Nanolithography and the University of Amsterdam, in an interview. “We can start making interfaces that either do it if we want to hear this sound, or don’t do it if we don’t want to hear it.”

Ramakrishnan writes for the Associated Press.

New England Patriots receiver Mack Hollins has arrived to NFL games in some pretty interesting outfits.

His Fred Flintstone and Animal (from the Muppets) costumes worn during past pregame tunnel walks leap to mind.

None of that, however, quite compares to the look he sported before Super Bowl LX. Hollins entered Levi’s Stadium on Sunday wearing a maroon prisoner’s jumpsuit, shackles on his wrists and ankles, and a plastic mask covering his face from the nose down, similar to the one worn by Hannibal Lecter in “Silence of the Lambs.”

The back of Hollins’ shirt read “Range 13.” According to Ben Volin of the Boston Globe, that’s a reference to a special set of cells at a Florence, Colo., Supermax federal prison reserved for prisoners who need the tightest security.

The facility has been called “the Alcatraz of the Rockies” — so maybe Hollins’ outfit is a nod toward the Super Bowl being held in somewhat close proximity to the former (for now, at least) federal prison in the San Francisco Bay.

Also, Hollins wears jersey No. 13, so it could be a reference to that as well. The front of his shirt featured the prisoner number “P-131311” and that could possibly mean … something?

Speaking of football jerseys, Hollins also was carrying one from Walsh Jesuit High School bearing the number 84. That one is actually easily explained — it’s the high school jersey (or, presumably, a replica of it) once worn by Patriots coach Mike Vrabel. Hollins went on to wear the jersey during warmups before Sunday’s game.

New England Patriots wide receiver Mack Hollins wears coach Mike Vrabel’s high school jersey while warming up before Super Bowl LX.

(Sue Ogrocki / Associated Press)

One other thing to note about Hollins’ attire for his stadium entrance and during warmups — he wasn’t wearing shoes. That might have been the least surprising aspect of Hollins’ pregame looks since he has been known to wear shoes only when absolutely necessary.

“Everyone should be barefoot,” Hollins told NBC Sports in 2023. “You don’t see people walking around in mittens.”

He added: “Shoes are definitely dirtier than feet. Because I wash my feet all the time. When’s the last time you washed the bottom of your shoe?”

So, yeah, Hollins is a pretty quirky guy. According to Frank Schwab of Yahoo! Sports, Hollins does not eat vegetables, avoids drinking water (his preference is watermelon juice) and prefers to eat with his hands rather than use utensils.

“He’s probably No. 1 on the unique list,” Patriots receiver Stefon Diggs said of Hollins during Super Bowl week. “He’s actually taught me a lot. Alternative medicines, things he does, things he eats, how he moves on the daily. He is definitely one of my different teammates.’”

New England Patriots receiver Mack Hollins catches a pass as Seattle Seahawks’ Riq Woolen defends during Super Bowl LX on Sunday in Santa Clara.

(Charlie Riedel / Associated Press)

In eight NFL seasons, Hollins played for the Philadelphia Eagles (winning a Super Bowl ring following his rookie season in 2017), Miami Dolphins, Las Vegas Raiders, Atlanta Falcons and Buffalo Bills before signing with the Patriots last offseason.

Hollins was the Patriots’ leading receiver during their 29-13 loss to the Seattle Seahawks at Super Bowl LX. He had four catches for 78 yards, including a 35-yard touchdown reception from quarterback Drake Maye in the fourth quarter.

Stacey Hamilton has stayed in hundreds of hotels and says a simple visual reminder has saved her from costly mistakes when checking out

If you’re a seasoned jet-setter, you’ll be all too familiar with the minor irritations that come with hotel stays. From inconveniently placed plug sockets to baffling air conditioning controls and light switches that seem to operate something in another postcode.

Stacey Hamilton, a travel guru from Private Tours England, who has clocked up hundreds of hotel stays both in the UK and abroad, has revealed her go-to trick for hassle-free hotel living. From securing valuables to smarter packing and ensuring a good night’s sleep, she claims these simple hotel hacks have saved her time, money and a fair few early morning scrambles.

One particular technique she swears by might sound a bit odd, but it’s come to her rescue on numerous occasions.

Stacey admitted: “For years, I avoided using hotel safes because I was convinced I’d forget what I’d put in there. It sounds silly, but when you’re rushing to catch a train or heading out early with guests, it’s very easy to walk out and leave valuables behind.”

To combat this, she now always stashes one of her shoes in the safe along with her passport and jewellery, reports the Express.

She explained: “I physically cannot leave the room without realising something is missing,” she says. “It’s usually a heel for me because I need them for work, but the principle works with anything you wouldn’t dream of leaving behind.”

“If you travel with trainers, pop one trainer in there. If it’s winter, your coat works just as well. The idea is to create a visual reminder you can’t overlook.”

Before checking out of the hotel, after retrieving her shoe and other valuables from the safe, Stacey always makes sure to take one item with her. She never departs a hotel without pocketing one of the complimentary shower caps.

She explained: “They’re perfect for covering shoes when you’re packing to come home.”

If your shoes have become dirty from extensive walking or hiking, it’s not ideal to pack them directly against your clothes in your suitcase. That’s where the shower cap comes in handy.

She said: “Instead of wrapping shoes in plastic bags or hoping for the best, I slip a shower cap over the sole. It keeps everything else clean, and it packs neatly.”

Stacey also revealed another clever use for the shower cap.

She shared: “I also use shower caps on TV remotes. Let’s be honest, those things are filthy. It’s a simple barrier that makes me feel a lot better, especially if I’m staying somewhere for a few nights.”.