7 Science-Approved Tips for Walking Across Ice

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Unless you live in a warm climate year-round where the only ice you experience involves cubes that tumble from your refrigerator door, the issue of slipping on the slick surface presents a serious concern. After all, news segments talk of treacherous conditions where people unable to gain traction slide themselves into oblivion just crossing the street. On the work front, the Bureau of Labor Statistics reports that in 2014, ice, snow, or sleet caused more than 42,000 injuries and illnesses.

And of course, there will always be viral ice-slipping videos floating around, like the one of the man who slid along the entire length of his driveway.

The very act of walking is a balancing act we take for granted. "Walking is like falling and catching yourself over and over," says Kayla Lewis, Ph.D., an assistant professor of physics at New Jersey's Monmouth University. "You lean forward and fall forward, catching yourself with your leading leg to prepare for the next step. But it's the friction between the ground and your shoes that enables you to save yourself this way; it prevents your front shoe from sliding forward and your back shoe from sliding backward."

All of this begs the question: What's the best way to walk on ice to minimize the risk of falling? To safely sashay over ice, follow the experts' advice below. Don't let their words of wisdom, you know, slip away from you.

1. MOVE SLOWLY AND STEADILY.

Clearly, instinct and common sense kicks in the moment you approach the slick surface, telling us it's virtually impossible (and not really wise) to sprint across an ice-covered driveway. Slow and easy wins the proverbial race, right?

Yes. According to Philip E. Martin, Ph.D., professor and chair of the Department of Kinesiology at Iowa State University, minimizing forward and backward force is indeed essential when walking on ice. "What's key is trying to keep force applied to the ground more vertically so there's less force forward and backward—because that's the part that requires friction," he tells Mental Floss.

2. TAKE SHORTER STEPS.

What does reducing forward-and-backward force mean practically? Taking shorter steps. When we do so, the forces applied against the ground in forward and backwards directions are reduced. Therefore, Martin says, we're not pushing as hard and are "adapting our gait to work with the reduced friction that's available to us."

3. AVOID MELTING ICE.

Mark Fahnestock, a glaciologist and research professor at the University of Alaska Fairbanks, has been studying glaciers and ice sheets for the last couple of decades, and during that time has experienced conditions at -40°F in Alaska. He says that how slippery ice becomes can vary by temperatureso being aware of temperatures can help you figure out how easy or challenging it may be to cross ice. "It's easier to walk on ice at 0°F or -20°F," he tells Mental Floss. "Ice is much slipperier when it's really melting."

Chalk that up to a film of molecules on the surface that behaves like water, he says, which "becomes more pronounced" in warmer temperatures. However, this isn't to say you won't ever slip on ice the colder the temperature gets; he emphasizes, "It's not that it's not slippery, it's just that it's not as slippery as when it's warmer."

4. GO AROUND SLOPES AND STAIRS WHEN YOU CAN.

You should also be mindful of the surface you're about to set foot on. A flat surface is one thing, but Fahnestock says that "if it's slanted where your foot meets a driveway, for example, it's not holding your weight—rather, it's your weight that's causing your foot to move."

"Gravity is going to do its thing whether you like it or not," Martin says, especially if there's an icy slope that's in a significantly downhill direction. Unfortunately, in this circumstance, you probably won't be able to adapt your gait to prevent slipping, so it's likely it'll be a score of Ice 1, Human 0.

ice caution sign next to person who slipped on ice
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Stairs can make navigating ice even more treacherous, but we know it's not always possible to avoid them. According to helpful hints for walking on ice from Iowa State University, when dealing with icy steps, be sure to use handrails, keeping your hands out of your pockets, and continue to move slowly.

5. KEEP AN EYE OUT FOR CHANGING SURFACES.

Then there are circumstances where the surface characteristics can change without us realizing it. But Martin says not to fret if you're walking on a straight, dry surface and suddenly encounter an icy patch you weren't expecting. Maximum friction force is reduced when you encounter this abrupt change, causing you to quickly alter your gait. Sure, you may slip a little since it initially throws you off guard, but "humans are pretty adaptable and recognize challenges quickly," Martin says. We pay closer attention to surface characteristics than we may consciously realize, and we adjust our stride patterns automatically.

6. WEAR THE RIGHT SHOES.

And don't forget the benefits of appropriate footwear. Martin encourages people to consider a shoe's material properties, noting that a rigid leather sole is far from ideal as it offers a significantly weaker grip compared to a rubber sole. Of course, traction-improving treads, cleats, or spikes can help too.

Scientists are studying how traction varies among consumer boots. A team of researchers at iDAPT, the research arm of the Toronto Rehabilitation Institute—University Health Network, has tested and rated the slip resistance of nearly 100 boots and spikes in their WinterLab, where they study slips and falls on a floor composed entirely of ice. Testers secured into safety harnesses walk back and forth across the ice as the researchers slowly increase the angle of the floor until the tester slips. The angle at which they slip is called the "maximum achievable angle": The higher the angle, the better the slip resistance.

More than 80 percent of the boots they've tested failed to score high enough on the MAA to earn a single "snowflake" on iDAPT's three-snowflake scale, including those from popular brands like Timberland, Sorel, and Terra. The top ranked, with three snowflakes, are all Stabil spikes, which attach to your regular shoes or boot.

7. WHEN ALL ELSE FAILS, WADDLE.

Consider taking an ice-walking cue from those waddling tuxedoed ice pros: Walk like a penguin. Fahnestock says shuffling helps keep your weight in a straight-down stance, allowing your feet to carry your weight carefully and minimize slipping.

10 Citizen Science Projects That Need Your Help

A citizen scientist takes a photo of scarlet mushrooms.
A citizen scientist takes a photo of scarlet mushrooms.
lovelypeace/iStock via Getty Images

Channel your inner Nikola Tesla or Marie Curie by participating in actual scientific research, either out and about or without even leaving your couch. These projects unleash the power of the public to be places that researchers can’t be and to spread the workload when data start piling up. They really can’t do it without you.

1. Catalog photos of Earth's cities at night.

Photo from space of a city at night
Identify cities from the photos taken from the International Space Station.
Chris Hadfield, NASA // Public Domain

Cities at Night—a study by Complutense University of Madrid—asks people to catalog images of the Earth at night taken from the International Space Station, part of the millions of images in the Gateway to Astronaut Photography of Earth database. The current project, Lost at Night, needs people to identify cities within images of 310-mile circles on Earth. Hundreds of volunteers have classified thousands of images already, but classification by multiple individuals ensures greater accuracy. In fact, the project will determine the optimum number of people needed. The primary goal is an open atlas of publicly available nighttime images. Just log on to the image database to help.

2. Follow fish using high-tech tags.

You’ll have to go fishing—an outdoor activity you can do by yourself!—for this assignment. Volunteer to tag fish for the American Littoral Society, whose citizen scientists have tagged more than 640,000 fish since the program began in 1965. You can tag the fish you catch and release, or report tagged fish to the organization. The data is sent to the National Marine Fisheries Service Laboratory in Woods Hole, Massachusetts, where it helps scientists track the populations and movements of coastal species like striped bass, flounder, and bluefish. To get started, become a member of the American Littoral Society, which comes with a packet of tagging gear and instructions.

3. Spy on penguins in Antarctica.

Penguins on an ice floe
Keeping tabs on penguins is one way a citizen scientist can lend a hand.
axily/iStock via Getty Images

Here's another project for those stuck indoors. Penguins are threatened by climate change, fisheries, and direct human disturbance, yet scientists have little data on the birds. To fill in the gaps, 50 cameras throughout the Southern Ocean and Antarctic Peninsula take images of colonies of gentoo, chinstrap, Adélie, and king penguins year-round. You can help the University of Oxford-based research team by sorting through thousands of images to identify and mark individual adult penguins, chicks, and eggs. You'll be pinpointing seasonal and geographic variations in populations that may represent changes to the Antarctic ecosystem. Marking other animals in the images helps researchers figure out which ones are hanging around penguin colonies. Discuss a specific image or the project with the science team and other volunteers in an online forum.

4. Battle an invasive marine species.

Like to dive or snorkel? Make it count by reporting lionfish sightings or captures to the Reef Environmental Education Foundation's Volunteer Reef Survey Project. Lionfish, which are native to the Indo-Pacific, were first sighted in the South Atlantic in 1985 and were likely released by private aquarium owners. Since then, they have spread throughout the Caribbean and Gulf of Mexico and caused native fish populations to decline by up to 80 percent. Scientists say this invasion may be one of the century’s greatest threats to warm temperate and tropical Atlantic reefs. You can also join a lionfish derby to catch and kill some of the tasty fish so scientists can analyze their biology.

5. Count birds from your backyard.

Bluebirds at a bird feeder
Bluebirds dine on mealworms at a bird feeder.
MelodyanneM/iStock via Getty Images

North American birds are in trouble. Recent studies predict dramatic declines in the populations of migratory birds due to climate change—and much of the data that went into these studies came from citizen scientists who monitored species without leaving home. The Cornell Lab of Ornithology and Birds Canada launches Project FeederWatch in the winter months; you simply put out a bird feeder and report the number and species of birds that visit it. Citizen scientists can also join the Cornell Lab's NestWatch—you find a nest, monitor it every three or four days, and report your data. And every February, the Audubon Society runs the Great Backyard Bird Count, in which participants submit data to produce a real-time snapshot of bird populations across North America. Any time of the year, birdwatchers can submit lists of the birds they see on eBird, a huge database of sightings that informs public policy, conservation efforts, and other initiatives.

6. Photograph plants for climate change research.

The Appalachian Mountain Club's Mountain Watch program asks hikers to document alpine and forest plants for ecological research. By taking photos of flowers and fruiting plants along woodland trails and uploading them to the iNaturalist app, participants provide data about the times and places that plants bloom. Scientists then compile the information in an online database and analyze it for trends that could indicate changing climates.

7. Comb through ships' logbooks for weather data.

Old handwritten letters
Practice your handwriting-deciphering skills on the Old Weather project.
scisettialfio/iStock via Getty Images

Ships’ logs from mid-19th century American sailing vessels contain detailed weather observations. Citizen scientists can help transcribe observations from whaling vessels for the Old Weather project; scientists will use the information to learn more about past environmental conditions and create better climate models for future projections. Historians will also use the data to track past ship movements and tell the stories of the people on board.

8. Make American history documents and science notes accessible to more people.

The Smithsonian Libraries are stuffed with original history and science documents that have lain in drawers for decades. Help open up "America's attic" to the public by organizing and transcribing digital versions of handwritten field notebooks, diaries, logbooks, specimen labels, photo albums, and other materials. You'll join thousands of other volunteers to investigate documents like the Sally K. Ride Papers, the collection of the Freedmen's Bureau (which helped former slaves following the Civil War), and field studies of insects by the Irish naturalist Arthur Stelfox.

9. Investigate historical crimes in Australia.

Drawing of a convict ship to Australia
A drawing of a 19th-century convict ship destined for Australia.
Photos.com/iStock via Getty Images

If you're obsessed with true crime, you'll love this project. Volunteer to investigate and transcribe criminal records from 19th- and 20th-century Australia, which was founded as a British penal colony. Alana Piper, a postdoctoral research fellow at the Australian Centre for Public History at the University of Technology Sydney, will use the transcriptions to construct the "life histories and offending patterns of Australian criminals" from the 1850s to the 1940s. More than 40,000 subjects have been completed so far.

10. Map the unique features of Mars's South Pole.

Travel to Mars—without the hassle of zero gravity or space-vegetable farming—through Planet Four, a citizen science project that is currently tasked with identifying features on Mars's dynamic South Pole. Volunteers examine photos from the HiRISE camera on NASA's Mars Reconaissance Orbiter and pick out "fans" or "blotches" in the landscape of seasonal carbon dioxide ice. Scientists believe these structures indicate wind speed and direction on the Martian surface and offers clues about the evolution of the Red Planet's climate.

Why Cats Like to Shove Their Butts in Your Face, According to an Animal Behavior Expert

This cat might be happier showing off its butt.
This cat might be happier showing off its butt.
Okssi68/iStock via Getty Images

Cats are full of eccentric behaviors. They hate getting wet. Their tongues sometimes get stuck midway out of their mouths, known as a “blep.” And they’re really happy hanging out in bodegas.

Some of these traits can be explained while others are more mysterious. Case in point: when they stick their rear end in your face for no apparent reason.

Are cats doing this just to humiliate their hapless caregivers? What would possess a cat to greet a person with its butt? Why subject the person who gives you food and shelter to such degradation?

To find out, Inverse spoke with Mikel Delgado, a postdoctoral fellow at the School of Veterinary Medicine at UC Davis. According to Delgado, cats don’t necessarily perceive their rectal flaunting as anything aggressive or domineering. In fact, it might be a cat’s way of saying hello.

“For cats, it’s normal for them to sniff each other’s butts as a way to say hello or confirm another cat’s identity,” Delgado said. “It’s hard for us to relate to, but for them, smell is much more important to cats and how they recognize each other than vision is. So cats may be ‘inviting’ us to check them out, or just giving us a friendly hello.”

For a cat, presenting or inspecting a butt is a kind of fingerprint scan. It’s a biological measure of security.

Other experts agree with this assessment, explaining that cats use their rear end to express friendliness or affection. Raising their tail so you can take a whiff is a sign of trust. If they keep their tail down, it’s possible they might be feeling a little shy.

If you think this situation is eased by the fact you rarely hear cats fart, we have bad news. They do. Because they don’t often gulp air while eating, they just don’t have enough air in their digestive tract to make an audible noise. Rest assured that, statistically speaking, there will be times a cat giving you a friendly greeting is also stealthily farting in your face.

[h/t Inverse]

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