When you’re a few decades out of school, it’s easy to forget even the basics of the U.S. education curriculum. What’s the quadratic formula, again? What’s the Fifth Amendment all about? Only two people have ever won Are You Smarter Than a 5th Grader’s $1 million 5th Grade curriculum question, after all.

Eighth grade science curriculum is, needless to say, even harder. The experts at STAT recently put together a quiz that can dash all your hopes of helping your 8th grader with science homework, testing your knowledge of middle school biology in 10 simple (ish) questions.

Unless you’ve taken a refresher on basic cell biology recently, you may not do so well. For instance, I got seven out of 10 answers correct, putting me on the edge of having all of my science writing assignments yanked away from me. Enjoy having your self-esteem dashed!

Take the quiz over at STAT.

Of all the game-changing innovators over the past century, the engineers who have eliminated the need to sweep and vacuum manually deserve special recognition for their ingenuity and, dare we say it, heroism. (Pet owners: You know what we’re talking about.) Small, intelligent vacuum bots can navigate living rooms, avoid bumping into furniture, and know better than to try and suction up your cat’s tail. But how do they work?

Although their exact behavior depends on the manufacturer, robotic vacuums generally operate by cleaning as far as they can go in one direction until they bump into an object, turn around, and continue cleaning randomly around a room in shapes resembling the ones your spiral toy used to draw. Robotic vacuums also utilize sensors to help them determine where to clean, as well as which areas to avoid (the top of a staircase, for example).

More intelligent robotic vacuums can actually map out a room to plan out a methodical cleaning path and avoid obstacles before running into them. Some do this using cameras, while others use lasers to navigate. These robots detect reflections on the laser to determine where obstacles are in 360 degrees, allowing the robot to both create a map, and know where it is within the map. These robots track what has been cleaned and what is left to clean until they’ve finished that particular section of your home.

These robots may also boast dirt-detect functions that allow them to take note of how much dirt is being kicked up by their brushes, and give more attention to cleaning those areas. (If you’ve managed to knock over a potted plant, for example, the machine would clean that area more thoroughly.) Many robots also have a wall-following capability; using this method, the robot continues cleaning alongside an obstacle, using an infrared sensor to detect how close to the obstacle the robot can get without bumping into it.

Still on the fence about a robot vacuum? In the future, the carpeting industry may help convince you. Plans are underway to embed sensors under floor padding that will help these machines clean with even greater accuracy.

Don’t sweat the small stuff—leave that to NEATO. The smart robot vacuums from Neato Robotics make light work of messy floors, thanks to their laser navigation technology, powerful suction, and D-shape that gets into and cleans corners. The best part? While they clean, you can get on with the things that really matter. Visit Neato Robotics to learn more about their line of Botvac Connected robot vacuums.

Throughout the year crowds of the faithful flock to holy relics, like the supposed preserved umbilical cord of Jesus in Rome or the blood of St. Januarius in Naples. Such reverence for objects associated with the departed extends beyond the world of religion, though, and into the market for celebrity memorabilia. Like the corporeal remains of saints, even everyday celebrity possessions can become the focus of intense attention long after their owner has died. These items—and in rare occasions, the physical remains of stars themselves—are highly sought-after when they appear at auctions. Below are nine examples of death-related celebrity memorabilia that have emerged in public sales over recent years.

1. THE GUN THAT ENDED VERLAINE AND RIMBAUD’S AFFAIR

It was poetry that brought Arthur Rimbaud and Paul Verlaine together, but violence that eventually tore their passionate but turbulent romance apart. The poets’ nearly two-year relationship ended, literally, with a bang: in 1873, a very drunk Verlaine unsuccessfully attempted to kill his 18-year-old lover with a revolver in a Brussels hotel room, tired of Rimbaud’s capriciousness and longing to return to his wife and child. On November 30, 2016, that 7mm gun—pictured above on display in 2015—is being sold at Christie’s. (A serial number on its case ties it to Verlaine, as documented in a gunsmith’s records; it’s previously been in a private collection.) The gun fired two bullets, wounding its victim’s wrist and sending its shooter to jail for two years. Later that year, Rimbaud published Une Saison d’Enfer, a collection of poems partially inspired by his fraught times with Verlaine. For French literary enthusiasts, this may represent more than a weapon, encapsulating the emotions that led to some of the most celebrated works of 19th century French poetry.

2. A SCRAP OF WALLPAPER FROM THE ROOM WHERE LINCOLN DIED

The obsession that Civil War veteran Osborn Oldroyd had with memorabilia tied to America’s 16th president is perhaps unparalleled. A renter of Lincoln’s Springfield home, Oldroyd transformed the space into a museum after the politician’s assassination and was rumored to have cut off bits of curtain, wallpaper, and even flooring to sell as souvenirs. It seems he made similar incisions in the bedroom of the Petersen House, where Lincoln died, preserving a fragment of wallpaper in a book. That scrap sold at auction for $1000 in August 2016, evidently still an object of intrigue 150 years from that tragic day.

A much more grisly auction lot was the rocker in which the president was sitting when John Wilkes Booth shot him. Owned by the theater’s treasurer, it was sold in 1929 by his widow and purchased by Henry Ford for the price of $2400.

3. NAPOLEON’S DEATH SHIRT

Here’s one to curl up on your couch and read: Family Goes to War Over Napoleon’s Nightshirt http://t.co/2cFHE4iQyb pic.twitter.com/I7ygv1Y1B7

— T Magazine (@tmagazine) May 18, 2014

When Napoleon lay dying in 1821, he was perspiring profusely from a fever. His sweat-stained nightshirt was saved by his stablemaster Achille Archambault, who had remained by the exiled emperor’s side during his illness. In 2014, the garment was headed to an auction in Fontainebleau, where it was estimated to sell for up €40,000 (about $42,000 USD). But it proved too precious for an auction: Archambault’s descendants obtained an injunction at the last minute to halt the sale of the nightshirt and other possessions of Napoleon’s, worried that the items would go overseas and deprive their country of objects of its heritage. (Other, more private, parts of Napoleon have been repeatedly sold at auction—his penis is currently said to be in storage in New Jersey.)

4. TRUMAN CAPOTE’S ASHES

Portions of Truman Capote’s ashes have long been in demand. In September 2016, some of the famed writer’s remains, kept in a beautifully carved Japanese wooden box, were sold in a Los Angeles auction. They had belonged to Joanne Carson, who apparently said that owning the ashes brought her great comfort. That may now hold true for someone else: whoever it was that bought them for $43,750.

5. A DROP OF RONALD REAGAN’S BLOOD

When a vial purportedly containing a drop of President Reagan’s blood hit the auction block in May 2012, it received bids up to $30,086. But the sale was also heavily condemned, most notably by the Ronald Reagan Presidential Foundation, whose executive director threatened a lawsuit, saying that it violated Reagan’s privacy as a patient. The blood had been drawn at George Washington University Hospital after an assassination attempt in 1981, and had been kept by a lab worker. The blood remained in her possession until her son decided to sell it following her death in 2010. The individual who bought it then—for $3550—eventually decided to withdraw it from the May 2012 sale and instead donated it to the Reagan Foundation.

6. BONNIE PARKER’S BLOODSTAINED STOCKING

Among the trove of rifles, pistols, and rounds of ammunition found in the Ford driven by Bonnie and Clyde during their final shootout was a woman’s silk stocking. Stained with blood, it is believed to have belonged to the outlaw herself and was auctioned off in 2012 as the only item worn by Bonnie Parker that had ever been sold. The garment was part of a single lot of macabre Bonnie and Clyde memorabilia to emerge from that “death car”—in total, the lot fetched $10,800.

7. A LOCK OF THOMAS JEFFERSON’S HAIR

Lock of Thomas Jefferson’s hair sold for nearly $7,000 at auction https://t.co/aBxGTTZenf (via @Telegraph)

— BBC History Magazine (@HistoryExtra) May 16, 2016

Though it seems macabre today, hair collections were a frequent feature of the 19th century. When Thomas Jefferson died on July 4, 1826, his doctor, Robley Dunglison, snipped off a lock of hair as a memento. The 14 short, tawny strands were preserved for nearly two centuries in a glassine envelope, and in May 2016, someone placed a winning bid of $6875 for the hairs. They came, as one would expect, with a signed letter of provenance.

8. THE WATCH LIKELY USED TO CALL JFK’S TIME OF DEATH

Many questions still linger around the assassination of President John F. Kennedy, but we at least know for certain the time of his pronounced death: 1 p.m. That time was called by the neurosurgeon Dr. Kemp Clark, who likely observed it on the wristwatch he was wearing that day—a rare, 18k gold Patek Philippe that was fitted with a pulsometer. Christie’s offered up the gleaming timepiece in 2013, and it sold for $161,000.

9. MARILYN MONROE’S FINAL SIGNED CHECK

Marilyn Monroe’s death also continues to raise speculation and breed conspiracy theories. Was it suicide? A check for $228.80, believed to be the last the star ever signed, may suggest not: dated to the day before her body was found, the document—which emerged at auction in 2012—was made out to a furniture company that delivered Monroe a new chest. As the folks at Heritage Auctions put it, “Would one be concerned with new furniture on the last day of one’s life? Probably not!” The slip of paper sold for $15,000—certainly a unique example of one of history’s most desired autographs.

As of 2015, women are more likely to hold a college degree than men, but men are still filling the boardrooms, making the decisions, and running our country. After interviewing more than 50 trailblazing executive women for her book Earning It, Joann Lublin says there are two traits that set apart the women who do make it to the top: resilience and persistence.

Lublin, who is also The Wall Street Journal‘s management news editor, says she has had many experiences similar to the women she interviewed for the book, which was why she was motivated to write it in the first place. When she made interview calls early in her career, she says, she was often mistaken for a subscription saleswoman rather than a journalist. But now, at the top of her career, she’s able to share ways other women can make it to the top, too.

RESILIENCE

If you’ve run to the bathroom in tears after receiving a talking down from your boss, you’ve got some work to do. But the great thing about resilience is it’s a learned quality—and you can fake it until you make it. “Resilience is the persistence to bounce back in the face of setbacks [in your] career and and personal [life],” Lublin says. “If you can’t have resilience, you can’t make any headway.”

Lublin shares Drugstore.com CEO and former Charles Schwab CIO Dawn Lepore’s story by way of example. In 2010, two years after Lepore beat a rare cancer of the appendix, her husband was diagnosed with multiple myeloma. This made Lepore the sole breadwinner for her family. She would work all day and then stay in the hospital until 2 a.m. “Her co-workers didn’t think she should keep working, and she considered giving up her board seats,” Lublin says. “She considered giving it all up to be with her husband.” But Lepore’s husband convinced her not to quit—neither of them wanted the cancer to win.

In 2013, Lepore told SUCCESS of her climb to the top, “I do think you need a lot of resilience and commitment, and I’ve always been a sucker for a challenge. There must be something innate to my personality—if you tell me I can’t do something, I want to prove I can.”

PERSISTENCE

“It’s the idea that it doesn’t matter what life throws at you—you turn it into lemonade and you keep pushing,” Lublin says.

As a 29-year-old high school English teacher, Abbe Raven was desperate to break into the television industry, Lublin says. So she joined dozens of other women at the lingerie department of Macy’s, where A&E TV executives were hosting a recruiting event. But when she saw all of her competition, Raven headed toward the door. With no applicable experience, she thought she’d never get a television job.

But as the event wound down, Raven told herself, “No, this is your shot,” Lublin says. So she turned around and introduced herself to the head of programming, who recommended that she call the vice president of the television studio. And that’s where Raven’s persistence finally kicked in. “She called him five times a day,” Lublin says. On the 10^th day, she said she’d do anything to get a job, even if it was just photocopying scripts. Raven was hired as an entry level employee and worked her way up through the ranks of the company. In 2005, she was named A&E Networks’s second CEO, and in 2013 she became its Chairman (she retired in early 2015 after 33 years with the company).

In the retirement memo she sent to her employees, Raven perfectly encapsulated her persistence:

When I started out xeroxing scripts and answering phones as a few dollars an hour assistant in 1982—I would never have imagined I would become a manager, director, and senior executive—not to mention the President and CEO and then Chairman of a major media company. That was never my goal. My goal was to find something I would love to do, something I could contribute to in my own way—something to be part of.

Raven’s and Lepore’s stories are obviously extreme examples of persistence and resilience. But if you’ve ever negotiated a raise you deserved, applied for a competitive job, or leaned in to a new challenge, you already have a bit of their grit.