The Reason There's Over a Hundred Abandoned Giant Arrows Across the U.S.

Being an airmail pilot in the 1920s was a dangerous occupation—according to Half as Interesting, the average person in that profession died after just 900 hours of flying. One of the biggest dangers had to do with navigating at night; once darkness fell, pilots often had no idea where they were going. Aviation maps didn't exist yet, and this was decades before the days of GPS. For a while, pilots had to rely on giant bonfires next to landing strips. But eventually the U.S. government hit on a solution: thousands of giant glowing arrows, known as airway beacons, showing the way across the country. The arrows, accompanied by lighted towers and erected every 10-15 miles from New York to San Francisco, made airmail faster, cheaper—and most importantly, much safer for pilots.

By World War II, most of the arrows were scrapped as advances in radar and radio communications made them obsolete, but at least 121 still remain across the country. (CityLab notes that Montana still uses about 19 of them for pilots flying through the mountains.) And they haven't been entirely forgotten: The site Arrows Across America is devoted to photos and details of the remaining arrows.

You can learn more about how the arrows worked, and where they are now, in the Half as Interesting video below.

Learn Python From Home for Just $50

Andrea Piacquadio / Pexels.com
Andrea Piacquadio / Pexels.com

It's difficult to think of a hobby or job that doesn’t involve some element of coding in its execution. Are you an Instagram enthusiast? Coding and algorithms are what bring your friends' posts to your feed. Can’t get enough Mental Floss? Coding brings the entire site to life on your desktop and mobile screens. Even sorting through playlists on Spotify uses coding. If you're tired of playing catch-up with all the latest coding techniques and principles, the 2020 Python Programming Certification Bundle is on sale for $49.99 to teach you to code, challenge your brain, and boost your resume to get your dream job.

Basically, coding is how people speak to computers (cue your sci-fi vision of a chat with a creepy, sentient computer), and while it does sound a bit futuristic, the truth is that people are talking to computers every day through a program called Python. The 2020 Python Programming Training Certification Bundle will teach you how to build web applications, database applications, and web visualizations in the world’s most popular programming language.

Python is also the language computers are using to communicate back to programmers. You’ll learn how Jupyter Notebook, NumPy, and pandas can enhance data analysis and data visualization techniques with Matplotlib.

Think back to your creepy, sci-fi visual from earlier; was it some form of artificial intelligence? Contrary to what you may have seen in the movies, artificial intelligence is something you can learn to create yourself. In the Keras Bootcamp, you’ll learn how to create artificial neural networks and deep-learning structures with Google’s powerful Deep Learning framework.

Coding is associated with endless text, numbers, and symbols, but the work code is performing is hardly limited to copy. Dig deep into image processing and computer vision tasks with sessions in OpenCV. You’ll give yourself an extra edge when you can use Python for sifting through information and implement machine learning algorithms on image classification.

Explore coding education with the bundle’s 12 courses, spanning from beginner to advanced levels, to elevate your skillset from home. The 2020 Python Programming Certification Bundle is on sale for $49.99.

 

The Complete 2020 Python Programming Certification Bundle - $49.99

See Deal



At Mental Floss, we only write about the products we love and want to share with our readers, so all products are chosen independently by our editors. Mental Floss has affiliate relationships with certain retailers and may receive a percentage of any sale made from the links on this page. Prices and availability are accurate as of the time of publication.

Remembering Sara Little Turnbull, Whose Bra Cup Design Became the N95 Mask

Design innovator Sara Little Turnbull.
Design innovator Sara Little Turnbull.
Photo Credit: © Center for Design Institute

The coronavirus pandemic has made something of a celebrity out of the N95 mask, a particle-filtering face covering that’s long been used to protect wearers from inhaling or exhaling pathogens. (The “95” refers to the fact it can block 95 percent of airborne particles.)

Like most nondescript and pervasive products, not many people stop to think about where it came from. Now, owing to the attention placed on it as a key tool in the health care professional’s fight against coronavirus, the woman behind the mask has come to the forefront. Her name is Sara Little Turnbull, and she designed what would become the N95 based on the shape of a bra cup.

A design consultant, Turnbull was working with the 3M company in 1958 in their gift wrap and fabric division when she was exposed to Shapeen, a non-woven material made of polymers and used for decorative ribbons. Turnbull was fascinated by the molded version of Shapeen and devised the first-ever pre-made bows for gift wrap.

Turnbull didn’t stop there. She saw endless possibilities in Shapeen and assembled an audience of 3M executives to present a number of ideas she had for products—more than 100 in all—using the material. At the presentation, which she titled “Why,” she impressed 3M with the scope of Shapeen's potential. The company quickly enlisted her to work on a design for a molded bra cup.

But Turnbull had another, arguably more important notion. At the time, she was taking care of three ailing family members who were under the care of doctors. Turnbull was often in a medical setting and noticed health care workers were constantly adjusting thin masks that tied in the back. She returned to 3M with the idea of using that same molded material to make a mask that would fit more comfortably on the face.

Again, 3M saw potential in Turnbull’s idea. By 1961, they introduced a non-woven lightweight medical mask based on her concept, with elastic bands instead of strings, an aluminum nose clip, and a form-fitting "bubble" shape. (The bra patent was approved in 1962.) Though innovative, the mask couldn't block pathogens for medical use and was marketed for dust filtration instead. An improved respirator hit the market in 1972 that was suitable for other industrial purposes. As the mask’s filtration evolved, so did its usefulness. In 1995, the N95 respirator was introduced in the health care field, fulfilling Turnbull's original ambition.

Though Turnbull had been relegated to a nondescript part of 3M, she had an extensive background in design, graduating from the Parsons School of Design in 1939 and later becoming the decorating editor of House Beautiful magazine. After Turnbull wrote an article taking companies to task for not designing products suitable for the end user, she was hired by 3M. As a consultant, she also collaborated with Corning, Revlon, General Mills, and Ford, among others.

After Turnbull died in 2015, the Sara Little Turnbull Center for Design Institute was formed, which offers information to the public on the value of design and supports the efforts of disadvantaged women's design education. Turnbull's vast archive of material is available to view by appointment. A foundation in her name also provides educational grants. The “Little,” incidentally, was in acknowledgment of her height. At 4 feet, 11 inches tall, Turnbull wasn’t terribly physically imposing. But her contributions were gigantic.

[h/t NPR]