Can You Solve Elon Musk's Favorite Brain Teaser?

Joe Scarnici, Getty Images/Best Events
Joe Scarnici, Getty Images/Best Events

"You're standing on the surface of the Earth. You walk one mile south, one mile west, and one mile north. You end up exactly where you started. Where are you?" This is the question that entrepreneur Elon Musk reportedly likes to ask candidates who interview for positions at SpaceX. The brainteaser was divulged in a 2015 biography about Musk, but it was recently revived when CNBC took to the streets of New York City to see if random passersby could get it right.

Before we reveal the answer below, a bit of background first. Big companies—especially ones in the technology industry—have been known to ask tricky interview questions that read like riddles. In the past, Google interviewees have been asked, "How many people are using Facebook in San Francisco at 2:30 p.m. on a Friday?" Hewlett-Packard has opted for the question, "If Germans were the tallest people in the world, how would you prove it?" And you've probably heard some variation of a question related to golf or tennis balls.

The purpose of these questions it not to make you feel dumb, but to see how you process information and solve complex problems. Interviewers are checking your analytical skills, and whether or not you arrive at the correct answer is almost secondary. But for the fun of it, keep reading to see if you nailed Musk's interview question. Are you ready? The answer is the North Pole. If you follow the directions in the question, you'd make a triangular path and end up back where you started.

There's another possible answer, but it's a little more complicated. The place in question is a circle with a one-mile circumference around the South Pole, and you'd start walking one mile north of it. "You'll walk one mile south to reach this circle, trace that mile-long circle's path, and return one mile north to your starting point," CNBC notes. (If you're having trouble visualizing it, check out this video from Business Insider, which offers a handy illustration.)

If you didn't get it right, don't feel too bad. Most of the New Yorkers who were polled didn't know the answer, either. Fortunately, this question probably won't come up in your average interview.

[h/t CNBC]

Amazon's Under-the-Radar Coupon Page Features Deals on Home Goods, Electronics, and Groceries

Stock Catalog, Flickr // CC BY 2.0
Stock Catalog, Flickr // CC BY 2.0

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

Now that Prime Day is over, and with Black Friday and Cyber Monday still a few weeks away, online deals may seem harder to come by. And while it can be a hassle to scour the internet for promo codes, buy-one-get-one deals, and flash sales, Amazon actually has an extensive coupon page you might not know about that features deals to look through every day.

As pointed out by People, the coupon page breaks deals down by categories, like electronics, home & kitchen, and groceries (the coupons even work with SNAP benefits). Since most of the deals revolve around the essentials, it's easy to stock up on items like Cottonelle toilet paper, Tide Pods, Cascade dishwasher detergent, and a 50 pack of surgical masks whenever you're running low.

But the low prices don't just stop at necessities. If you’re looking for the best deal on headphones, all you have to do is go to the electronics coupon page and it will bring up a deal on these COWIN E7 PRO noise-canceling headphones, which are now $80, thanks to a $10 coupon you could have missed.

Alternatively, if you are looking for deals on specific brands, you can search for their coupons from the page. So if you've had your eye on the Homall S-Racer gaming chair, you’ll find there's currently a coupon that saves you 5 percent, thanks to a simple search.

To discover all the deals you have been missing out on, head over to the Amazon Coupons page.

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Philadelphia Is Now Home to a Yarn Vending Machine

Emani Outterbridge with her yarn vending machine in Philadelphia.
Emani Outterbridge with her yarn vending machine in Philadelphia.
Emani Outterbridge

When 24-year-old Emani Outterbridge was stuck at home with a broken foot this past spring, she got to thinking of new ways to bring her self-made designer yarn to DIYers around Philadelphia. What she landed on was the idea of a yarn-dispensing vending machine, which she floated to her followers on social media.

They responded enthusiastically, and after a whirlwind fundraising campaign, Outterbridge ordered three machines, ready to be stocked with rows of brightly colored skeins. Earlier this month, the first one made its society debut at Elements of Grooming, a Philadelphia barber shop owned by a friend of Outterbridge’s. Soon, curious customers flooded the shop, and Outterbridge (who was on a business trip to Miami at the time) received excited updates from the owner. With the first vending machine already a proven success, she’s now looking to place the remaining two at other local businesses before ordering more.

Outterbridge's vivid skeins in the vending machine.Emani Outterbridge

Outterbridge doesn’t just make designer yarn—she also crochets custom items for her fashion line under the name “Emani Milan.” She’s been crocheting since she was 12 years old, and launched her own online business at age 15 after finishing an entrepreneur course in high school. She’s even designed items for Cardi B, whom she credits with elevating her profile. Outterbridge tells Mental Floss that the best part about being a business owner is the freedom to be “completely committed to my own success.”

Part of that success comes from understanding the needs of her fellow crocheters (and knitters), which helped her come up with the innovative vending machines in the first place. “I was thinking … if I had something that’s accessible to me 24 hours, mid-project, if I need to stop and go get some yarn, a vending machine would be ideal,” she explains.

Since the first vending machine is currently housed inside the barber shop—and future ones will likely live indoors, too—Outterbridge is hoping to open her own brick-and-mortar store in order to give people round-the-clock access to yarn. “With the salons and the shops—they close," she says. “But if I had my own store, I can have it open 24/7, so that’s what I’m pushing for.”

A future crocheter checks out the goods.Emani Outterbridge

In the meantime, she’ll continue offering her vibrant yarn skeins and garments through her website. Though you might assume a career crocheter would look forward to making cozy sweaters and scarves for chilly weather, Outterbridge actually prefers the summer months, which allow for more “creative range”—items like swimsuits, coverups, skirts, and rompers.

While you’re waiting for a yarn vending machine to land in your neighborhood, you can follow Outterbridge on Instagram and check out her products here.