19 Things You Might Not Know Were Invented by Women

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Necessity isn't the only mother of invention. Though it wasn't always easy to get patents or the credit they deserved, women are responsible for many items we use today.

1. THE PAPER BAG

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America got a brand new paper bag when cotton mill worker Margaret Knight invented a machine to make them with a flat square bottom in 1868. (Paper bags originally looked more like envelopes.) A man named Charles Annan saw her design and tried to patent the idea first. Knight filed a lawsuit and won the patent fair and square in 1871.

2. KEVLAR

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Lightweight, high-tensile Kevlar—five times stronger than steel—will take a bullet for you. DuPont chemist Stephanie Kwolek accidentally invented it while trying to perfect a lighter fiber for car tires and earned a patent in 1966.

3. THE FOOT-PEDAL TRASH CAN

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Lillian Gilbreth improved existing inventions with small, but ingenious, tweaks. In the early 1900s, she designed the shelves inside refrigerator doors, made the can opener easier to use, and tidied up cleaning with a foot pedal trash can. Gilbreth is most famous for her pioneering work in efficiency management and ergonomics with her husband, Frank. Two of their 12 children, Frank Jr. and Ernestine Gilbreth, humorously wrote about their home/work collaborations in the book Cheaper by the Dozen.

4. MONOPOLY

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Elizabeth Magie created The Landlord's Game to spread the economic theory of Georgism—teaching players about the unfairness of land-grabbing, the disadvantages of renting, and the need for a single land value tax on owners. Fun stuff! Magie patented the board game in 1904 and self-published it in 1906. Nearly 30 years later, a man named Charles Darrow rejiggered the board design and message and sold it to Parker Brothers as Monopoly. The company bought Magie's patent for the original game for $500 and no royalties.

5. WINDSHIELD WIPERS

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Drivers were skeptical when Mary Anderson invented the first manual windshield wipers in 1903. They thought it was safer to drive with rain and snow obscuring the road than to pull a lever to clear it. (Another woman inventor, Charlotte Bridgwood, invented an automatic version with an electric roller in 1917. It didn't take off, either.) But by the time Anderson's patent expired in 1920, windshield wipers were cleaning up. Cadillac was the first to include them in every car model, and other companies soon followed.

6. DISPOSABLE DIAPERS

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Marion Donovan didn't take all the mess out of diaper changing when she patented the waterproof "Boater" in 1951. But she changed parenting—and well, babies—forever. The waterproof diaper cover, originally made with a shower curtain, was first sold at Saks Fifth Avenue. Donovan sold the patent to the Keko Corporation for $1 million and then created an entirely disposable model a few years later. Pampers was born in 1961.

7. THE DISHWASHER

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Patented in 1886, the first dishwasher combined high water pressure, a wheel, a boiler, and a wire rack like the ones still used for dish drying. Inventor Josephine Cochrane never used it herself, but it made life easier for her servants.

8. LIQUID PAPER

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In the days before the delete key, secretary Bette Nesmith Graham secretly used white tempera paint to cover up her typing errors. She spent years perfecting the formula in her kitchen before patenting Liquid Paper in 1958. Gillette bought her company in 1979 for $47.5 million. And that's no typo.

9. ALPHABET BLOCKS

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Children don't read books by anti-suffrage author Adeline D.T. Whitney these days—and that's probably for the better. But the wooden blocks she patented in 1882 still help them learn their ABCs.

10. THE APGAR SCORE

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Life is a series of tests, starting with the Apgar, named after obstetrical anesthesiologist Dr. Virginia Apgar. In 1952, she began testing newborns one minute and five minutes after birth to determine if they needed immediate care. About 10 years later, the medical community made a backronym—an acronym designed to fit an existing word—to remember the criteria scored: Appearance, Pulse, Grimace, Activity, and Respiration.

11. MARINE SIGNAL FLARES

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Communication between ships was once limited to colored flags, lanterns, and screaming things like "Thar she blows!" really loudly. Martha Coston didn't come up with the idea for signal flares all by herself. She found plans in a notebook that belonged to her late husband. The determined widow spent 10 years working with chemists and pyrotechnics experts to make the idea a reality. But she was only named administratrix in the 1859 patent—Mr. Coston got credited as the inventor.

12. THE CIRCULAR SAW

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A weaver named Tabitha Babbitt was the first to suggest that lumber workers use a circular saw instead of the two-man pit saw that only cut when pulled forward. She made a prototype and attached it to her spinning wheel in 1813. Babbitt's Shaker community didn't approve of filing a patent, but they took full advantage of the invention.

13. RETRACTABLE DOG LEASH

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New York City dog owner Mary A. Delaney patented the first retractable leading device in 1908. It attached to the collar, keeping pooches under control, while giving them some freedom to roam. Incidentally, someone named R.C. O'Connor patented the first child harness 11 years later. Coincidence? Maybe.

14. SUBMARINE TELESCOPE AND LAMP

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It's difficult to find any in-depth information about early inventor Sarah Mather. Her combination telescope and lamp for submarines, patented in 1845, speaks for itself.

15. FOLDING CABINET BED

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Sarah E. Goode's folding cabinet bed didn't just maximize space in small homes. In 1885, it made her the first African-American woman with a U.S. patent. The fully functional desk could be used by day and then folded down for a good night's sleep. The Murphy bed came along some 15 years later.

16. THE SOLAR HOUSE

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Biophysicist Maria Telkes's place was in the house—the very first 100 percent solar house. In 1947, the Hungarian scientist invented the thermoelectric power generator to provide heat for Dover House, a wedge-shaped structure she conceived with architect Eleanor Raymond. Telkes used Glauber's salt, the sodium salt of sulfuric acid, to store heat in preparation for sunless days. Dover House survived nearly three Massachusetts winters before the system failed.

17. SCOTCHGARD

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Apparently, it takes a stain to fight one. In 1952, 3M chemist Patsy Sherman was perplexed when some fluorochemical rubber spilled on a lab assistant's shoe and wouldn't come off. Without changing the color of the shoe, the stain repelled water, oil, and other liquids. Sherman and her co-inventor Samuel Smith called it Scotchgard. And the rest is ... preserving your couch.

18. INVISIBLE GLASS

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Katharine Blodgett, General Electric's first female scientist, discovered a way to transfer thin monomolecular coatings to glass and metals in 1935. The result: glass that eliminated glare and distortion, which revolutionized cameras, microscopes, eyeglasses, and more.

19. COMPUTERS

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Women in computer science have a role model in Grace Hopper. She and Howard Aiken designed Harvard's Mark I computer, a five-ton, room-sized machine in 1944. Hopper invented the compiler that translated written language into computer code and coined the terms "bug" and "debugging" when she had to remove moths from the device. In 1959, Hopper was part of the team that developed COBOL, one of the first modern programming languages.

8 Tips for Interviewing a Serial Killer, According to Famed FBI Profiler John Douglas

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Over the course of his career, former FBI agent and behavioral analyst John E. Douglas has interviewed criminals ranging from repeated hijacker Garrett Trapnell and cult leader Charles Manson to serial killers Edmund Kemper (a.k.a. the Co-Ed Killer) and Dennis Rader (a.k.a. B.T.K.). In his new book, The Killer Across the Table, Douglas takes readers into the room as he interviews four very different offenders.

In these conversations, “I'm trying to gain [their] trust [to get] information that I'll be able to apply to current cases,” Douglas tells Mental Floss. Here, he outlines how he prepares for an interview with a killer to figure out what makes them tick.

1. Never go into an interview cold.

“Preparation is the number one factor for a successful interview” of this kind, Douglas says. “Before I go in to do an interview, [I] go back into the files and fully look at the case that got him or her incarcerated to begin with. Which means looking at the police reports, the preliminary protocol that the medical examiner did regarding the autopsy, autopsy photographs, and then looking in the corrections reports as well. You want to be totally armed with the case when you go in.”

2. Memorize everything—don’t use notes or a tape recorder.

Early on in his interviews with killers, Douglas used a tape recorder, which he now says was a mistake. “You're dealing with very paranoid individuals. They don't trust you, they don't trust the [corrections] system,” he says. “If my head is down, [they’ll ask], ‘What, are you taping this? Why are you writing these notes down?’” Memorizing the case is key—when he goes in, he won’t have notes or a tape recorder: “It's going to be key [for] me to maintain some eye contact with them.”

3. Make sure the environment is right.

The key in these interviews, Douglas says, is to make the environment feel open so that the killer feels comfortable and like he’s in control. “When you go into a prison, sometimes you're forced to deal with what you've got,” he says. “But if I have time, I try to [make arrangements] depending on the personality.”

Douglas prefers to conduct his interviews at night, relying only on low table lights to create a soothing, stress-free atmosphere. Douglas will even think about seating arrangements. “If I'm dealing with a real paranoid type of individual, I need to put this person near a window—if there's a window—so that he can look out the window and psychologically escape, or I may have him face a door,” he says. Both Charles Manson and Richard Speck chose to sit on the backs of their chairs so they could look down on him. Douglas’s attitude is: “You hate me. I know you hate me, but go ahead and do it. I'm just trying to get a little bit of information now.”

4. Don’t rely on what a killer tells you.

Douglas never takes a killer’s word for anything, which is why memorizing the case is so important. Typically, he knows the answers to the questions he’s asking, and it allows him to call out the offender if he or she lies. “If you don't look deeply into the material, you don't know who in the heck you're talking to,” Douglas says. “You're talking to somebody who's pulling the wool over your eyes … If [an interviewer relies] on self-reporting, they're going to be filled with a lot of lies coming from the person they're interviewing.”

5. Know that this is not an interrogation.

Once he knows who’s committed a crime, Douglas says, his main goal is to find out what motivated them. The best way to get that out of them is to ask his questions “in a very relaxed kind of a format, making the subject—even if it's a guy like Manson or some of the worst killers you'd ever want to meet—feel real comfortable and feel at the same time that they are controlling me during the interview.”

What Douglas ultimately tries to do is have a conversation with the offender. “That means if they're asking me a lot of questions about myself, about maybe my family, my job, and I'm pretty honest with them,” he says. “They will trust me and open up to me as long as they know that I know the case, backwards and forwards. If they start fudging on the case trying to send me down the wrong path, I will confront them, but not in mean [way]. I'll laugh and say, ‘Look, come on. I know what you did. What are you doing here?’ That’s how you gain their trust.”

6. Be mindful of your body language—and the actual language you’re using.

When he’s in an interview, Douglas isn’t sitting there with his arms crossed, looking uncomfortable. “The body language should be just relaxed, not a defensive kind of posture,” he says. “[It should be] very comfortable—like on a date kind of thing.”

Douglas also avoids words like killing, murder, and rape, and, as awful as it might sound, avoids placing the blame on the killer. “I'm trying to get him to talk so we're going to project the blame," Douglas says. "[Some killers] use this projection, never accepting responsibility, not admitting that it was free will, that they had the ability to make choices and they made the wrong choices in their lives, even though they may have come from a very, very bad background.”

This kind of approach is what helped Douglas gain insights from Ed Kemper. When Douglas asked how Kemper—who was 6 feet, 9 inches tall and 300 pounds—would get young women in his car, Kemper revealed that he would pull up next to them and look at his watch, which would give them the impression that he had somewhere to be. “I’ll go with this guy. He’s got an appointment, nothing’s going to happen to me,” Douglas says. “Just a little thing like that was real helpful to me.”

7. Play it cool, no matter what happens.

Being confrontational is no way to get a killer to open up. “In an interview, whether it's a serial killer or any type of violent offender, I'll never challenge them or be negative toward them,” Douglas says. “I'll never do anything like that. If I feel that they're not being truthful, I'll bring it to their attention. But I’m on a fact-finding mission. There are several shows on television right now where celebrity types are going into prisons doing interviews. They get in the guy's face and they call him a liar. [So] the guy, what does he want to do? ‘I want to go back to my cell. Screw you. I'm out of here.’ And you can't hold him there—he's got to go back. So, you never do anything like that.”

8. Don’t be afraid to feign empathy.

Sometimes getting what you need out of an offender means fudging the truth. Sometimes Douglas will tell the killer that he’s earning points with the warden by doing the interview. “There's still always this glimmer of hope that they'll get out of prison one day, even if they're in there for multiple murders,” he says. “The warden doesn't give a damn about him, but I'm just telling them this to try to get him to speak up.”

Sometimes Douglas will play to his subject's pride and narcissism. “They want to be the big daddy,” he says. "'But I'm the main guy, right? You're doing this research and you guys got the real McCoy here. I'm the best and the worst of the worst.'" And sometimes, he feigns empathy—all with the goal of finding out information that will help prevent and solve other crimes.

"Let the person feel they are in control of the interview,” Douglas says. "Be open with yourself. Give them information about yourself to this person and it should go well."

14 Secrets of McDonald's Employees

Justin Sullivan, Getty Images
Justin Sullivan, Getty Images

While there’s virtually no end to the number of fast food options for people seeking a quick meal, none have entered the public consciousness quite like McDonald’s. Originally a barbecue shop with a limited menu when it was founded by brothers Richard and Maurice McDonald in the 1940s, the Golden Arches have grown into a franchised behemoth with more than 36,000 locations worldwide.

Staffing those busy kitchens and registers are nearly 2 million McDonald's employees. To get a better idea of what many consider to be the most popular entry-level job in the nation—staff members on the floor make an average of $9 an hour—we asked several workers to share details of their experiences with errant ice cream machines, drive-through protocols, and special requests. Here’s what they had to say about life behind the counter.

1. McDonald's employees can't always deliver fast food all that fast.

While McDonald’s and other fast-service restaurants pride themselves on getting customers on their way, some menu items just don’t lend themselves to record service times. According to Bob, an assistant store manager at a McDonald’s in the Midwest, pies take an average of 10 to 12 minutes to prepare; grilled chicken, 10 minutes; and biscuits for Egg McMuffins, eight to 10 minutes. In the mood for something light, like a grilled chicken and salad? That will take a few minutes, too. Bob says salads are pre-made with lettuce but still need to have chicken and other ingredients added.

The labor-intensive nature of assembling ingredients is part of why the chain has more recently shied away from menu items with too many ingredients. “We are trained to go as fast down the line as we can, and if we have to stop to make something that has 10 ingredients, it tends to slow things down,” Bob tells Mental Floss. “Corporate has realized this and has taken many of these items off in recent years, [like] McWraps, Clubhouse, more recently the Smokehouse and mushroom and Swiss and moved to items that can go a lot quicker.”

2. McDonald's workers wish you’d stop asking for fries without salt.

A serving of McDonald's French fries is pictured
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A common “trick” for customers seeking fresh fries is to ask for them without salt. The idea is that fries that have been under a heating lamp will already be salted and that the employee in the kitchen will need to put down a new batch in the fryer. This does work, but customers can also just ask for fresh fries. It’s less of a hassle and may even save employees some discomfort.

“People can ask for fresh fries and it's actually way easier to do fresh fries rather than no-salt fries,” Andy, an employee who’s worked at three different McDonald’s locations in the Midwest, tells Mental Floss. “For those, we have to pour the fries onto a tray from the fryer so they don't come in contact with salt. It can get awkward sometimes getting everything into position, especially if you have a lot of people working in close proximity and it's busy, so I've had some scalded hands a couple of times trying to get fries out in a timely way.”

3. McDonald's workers have to pay careful attention to the order of ingredients.

McDonald’s is pretty specific about how their burgers and other items are supposed to be assembled, with layers—meat, cheese, sauce—arranged in a specific order. If they mess it up, customers can notice. “In some cases it has a big impact,” Sam, a department manager and nine-year veteran of the restaurant in Canada, tells Mental Floss. “Like placing the cheese between the patties with a McDouble. If they don’t put the cheese between the patties, the cheese won’t melt.”

4. There’s a reason McDonald’s employees ask you to park at the drive-through.

A McDonald's customer pulls up to the drive-thru window
Tim Boyle, Getty Images

After ordering at the drive-through window, you may be slightly puzzled when a cashier asks you to pull into one of the designated parking spots. That’s because employees are measured on how quickly they process cars at the drive-through. If your order is taking a long time to prepare, they’ll take you out of the queue to keep the line moving. “My store has sensors in the drive-through that actually tell us exactly how long you are at each spot in the drive-through,” Bob says. “We get measured based on something we call OEPE. Order end, present end. [That measures] from the second that your tires move from the speaker until your back tires pass over the sensor on the present window. My store is expected to be under two minutes.” If an order will take longer than that, you'll be asked to park.

5. The McDonald's drive-through employees can hear everything going on in your car.

While the quality of the speakers at a drive-through window can vary, it’s best to assume employees inside the restaurant can hear everything happening in your car even before you place an order. “The speaker is activated by the metal in the car, so as soon as you drive up, the speaker turns on in our headset,” Andy says. “We can hear everything, and I do mean everything. Loud music, yelling at your kids to shut up, etc.”

6. The employees at McDonald’s like their regulars.

Customers eat inside of a McDonald's with an order of French fries in the foreground
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With hot coffee, plenty of tables, Wi-Fi, and newspapers, McDonald’s can wind up being a popular hang-out for repeat customers. “[We have] a ton of regulars who come into my store,” Bob says. “I'd say at least 75 percent of my daily customers know us all by name and we know them all, too. It makes it nice and makes the service feel a lot more personal when a customer can walk into my location, and we can look them in the eye and say, ‘Hey Mark! Getting the usual today?’ and we've already started making his coffee exactly how he takes it.”

7. McDonald’s staff get prank calls.

Unless they’re trying to cater an event, customers usually don’t have any reason to phone a McDonald’s. When the phone rings, employees brace themselves. In addition to sometimes being asked a legitimate question like when the store closes, Sam says his store gets a lot of prank calls. “Sometimes it’s people asking about directions to Wendy’s,” he says. “A lot of inappropriate ones. Most are pretty lame.”

8. For a McDonald’s worker, the ice cream machine is like automated stress.

A McDonald's customer is handed an ice cream cone at the drive-thru window
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The internet is full of stories of frustrated McDonald’s customers who believe the chain’s ice cream machines are always inoperable. That’s not entirely true, but the machine does experience a lot of downtime. According to Bob, that’s because it’s always in need of maintenance. “The thing is, it is a very sensitive machine,” he says. “It's not made to be making 50 cones in a row, or 10 shakes at a time. It takes time for the mix to freeze to a proper consistency. It also requires a daily heat mode, [where] the whole machine heats up to about 130 degrees or so. The heat mode typically takes about four hours to complete, so you try to schedule it during the slowest time.” Stores also need to take the machine entirely apart every one to two weeks to clean it thoroughly.

Bob adds that the machine’s O-rings can crack or tear, rendering the unit inoperable. Seasoned workers can tell if a unit is faulty by the consistency of the shakes or ice cream coming out, and sometimes by the noises it makes.

9. McDonald's employees don't mind if you order a grilled cheese.

Contrary to rumor, there’s no “secret menu” at McDonald’s. But that doesn’t mean you can’t sometimes snag something not listed on the board. Andy says a lot of people order a grilled cheese sandwich. “I've made many a grilled cheese before,” he says. But it’s not without consequences. “Sometimes it can get a bit risky doing it because the bun toaster wasn't designed to make grilled cheeses so sometimes you get some burnt buns or cheese or the cheese sticks inside and it slows down the other buns from getting out on time so that causes more burnt buns.”

Another common request is for customers to ask for a McDouble dressed as a Big Mac, with added Big Mac sauce and shredded lettuce. “I think [it’s] a way more practical way to eat a Big Mac since there's less bun in the way, and it's also way cheaper even if you do get charged for Mac sauce.”

10. McDonald’s workers recommend always checking your order.

A McDonald's employee serves an order
Justin Sullivan, Getty Images

Nothing stings worse than the revelation that an employee has forgotten part of your food order. Contrary to popular belief, it’s not because the employees are being lazy or inattentive. According to Bob, it’s simply due to the volume of customers a typical location has to process in a given day. “We are human,” he says. “Mistakes do happen. We always feel terrible when they do but when we serve 1000-plus people a day, it's bound to happen.”

Bob recommends checking your bag before leaving the restaurant and not taking it personally if there’s an issue. “Be nice to us if you have a problem,” he says. “It's a huge difference between coming to us and saying, ‘Hey, I seem to be missing a fry from my bag,’ and ‘You bastards didn't give me my fries!’” If you want to check your bag at the drive-through, though, he recommends trying to pull ahead so cars behind you can move forward.

11. McDonald's employees don't recommend the grilled chicken.

If a menu item isn’t all that popular, it can wind up experiencing a low rate of turnover. Of all the food at McDonald’s, the most neglected might be the grilled chicken. Because it doesn't move quickly, workers find that it can turn unappetizing in a hurry. “That stuff has a supposed shelf life of 60 minutes in the heated cabinet, but it dries out so quickly that even if it's within an acceptable time frame, it looks like burnt rubber, and probably tastes like it, too,” Andy says.

12. Golden Arches employees aren’t crazy about Happy Meal collectors.

A McDonald's Happy Meal is pictured
David Morris, Getty Images

Happy Meals are boxed combos that come with a toy inside. Usually, it’s tied into some kind of movie promotion. That means both Happy Meal collectors and fans of a given entertainment property can swarm stores looking for the product. “The biggest pain involving the Happy Meals is the people who collect them,” Bob says. “I personally hate trying to dig through the toys looking for one specific one. We usually only have one to three toys on hand. It's especially a pain in the butt during big toys events such as the Avengers one we just had. There was like 26 different toys, and some customers get really mad when you don't have the one that they want.”

And no, employees don’t usually take home leftover toys. They’ve saved for future use as a substitute in case a location runs out of toys for their current promotion.

13. McDonald's employees can’t mess with Monopoly.

The McDonald’s Monopoly promotion has been a perennial success for the chain, with game pieces affixed to drink cups and fry containers. But if you think employees spend their spare time peeling the pieces off cups looking for prizes, think again. Following a widely-publicized scandal in 2000 that saw an employee of the company that printed the pieces intercepting them for his own gain, the chain has pretty strict rules about the promotion. “Monopoly pieces and things like them get sent back to corporate,” Bob says. “We aren't allowed to touch them, open them, or redeem them as employees.”

14. One McDonald's worker admits there have been sign mishaps.

A McDonald's sign is pictured
Tim Boyle, Getty Images

Many McDonald’s locations sport signs under the arches advertising specials or promotions. Some are analog, with letters that need to be mounted and replaced. Others have LED screens. Either way, there can be mistakes. “I've never seen anyone mess around with the letters,” Andy says. “But I do remember one time we were serving the Angus Burgers and the ‘G’ fell off of the word ‘Angus.’ Good times.”

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