![Thomas Edison loved a tough test. Thomas Edison loved a tough test.](https://images2.minutemediacdn.com/image/upload/c_crop,w_3838,h_2158,x_0,y_0/c_fill,w_1080,ar_16:9,f_auto,q_auto,g_auto/images/voltaxMediaLibrary/mmsport/mentalfloss/01jktmp8ds7bf9bcx9q2.jpg)
![Emily Petsko Emily Petsko](https://images2.minutemediacdn.com/image/upload/c_fill,w_180,ar_1:1,f_auto,q_auto,g_auto/shape/cover/sport/Avatar-506604a61526b245284fada6318d7365.png)
Emily Petsko
Joined: Apr 10, 2018
Emily Petsko is a former staff writer at Mental Floss. Her writing has appeared in Lonely Planet, The Guardian, and several lifestyle publications in Asia.
![Thomas Edison loved a tough test. Thomas Edison loved a tough test.](https://images2.minutemediacdn.com/image/upload/c_crop,w_3838,h_2158,x_0,y_0/c_fill,w_1080,ar_16:9,f_auto,q_auto,g_auto/images/voltaxMediaLibrary/mmsport/mentalfloss/01jktmp8ds7bf9bcx9q2.jpg)
![Roderick Eime, Wikimedia Commons // CC BY 2.0 Roderick Eime, Wikimedia Commons // CC BY 2.0](https://images2.minutemediacdn.com/image/upload/c_fill,w_1080,ar_16:9,f_auto,q_auto,g_auto/shape/cover/sport/539787-wikimedia-commons-2-2-03da6779b378e88164bf0090cafcb83c.jpg)
Titanic II Is Preparing to Set Sail in 2022, and You Can Be On Board
![iStock.com/VectorStory iStock.com/VectorStory](https://images2.minutemediacdn.com/image/upload/c_fill,w_1080,ar_16:9,f_auto,q_auto,g_auto/shape/cover/sport/539787-istock-878650636-fd99a99d612bfd10063f727c89c7c87e.jpg)
Why ‘Run’ Is The Most Complex Word in the English Language
![Red hair and freckles are two traits partially determined by genes. Red hair and freckles are two traits partially determined by genes.](https://images2.minutemediacdn.com/image/upload/c_crop,w_683,h_384,x_0,y_18/c_fill,w_1080,ar_16:9,f_auto,q_auto,g_auto/images/voltaxMediaLibrary/mmsport/mentalfloss/01jj7cgfka4y6vv1q4zk.jpg)
13 Facts About Genes
10 Tips for Stress-Free Holiday Travel
While we can’t promise that your journey to grandma’s house this year will be enjoyable, we know of a few travel tips to make it less stressful.
Graham Crackers Were Invented to Combat the Evils of Coffee, Alcohol, and Masturbation
Social media users regularly joke about the origins of the simple graham cracker as a way to curtail sexual impulses. And while it might sound bizarre, this is one viral trend that is based in truth.
You Can Use Your FSA or HSA Card to Pay for Medical Items on Amazon
Don't want to make an unnecessary trip to the store to pick up eye drops or sunscreen? You can order them online, using the pre-tax money in your account.
This Wall Chart Shows Every Species in the Cat Kingdom
From the humble house cat to the pointy-eared lynx.
15 Products to Help You Keep Your New Year’s Resolutions
Here are 15 products that can help you achieve your New Year’s resolutions, including innovative water bottles, notebooks, and more.
7 Surprising Facts About Hans Christian Andersen
Hans Christian Andersen once stayed with Charles Dickens. By the end of the five-week visit, Dickens was so exasperated with Andersen he ended the friendship.
Here’s the Real (No Good) Reason Glasses Are So Expensive
You're getting ripped off, big time.
6 Facts About Sojourner Truth, the 19th-Century Abolitionist and Feminist
While Truth wasn't her real name, 19th-century abolitionist and feminist Sojourner Truth made it her life's mission.
The Right Way to Pronounce 'Dachshund'
Dachshund is actually made up of two smaller German words (dachs, which means “badger,” and hund, which means “dog”) and it's not pronounced “dash-hound.”
Bloody Mary: Why We Think We See Ghosts in Mirrors
The spooky Bloody Mary phenomenon has a scientific explanation.
13 Chill Facts About Sloths
Why are sloths so slow? Discover these fascinating facts about sloths, from their unique anatomy to their surprising swimming abilities.
What Was the Bestselling Book the Year You Were Born? This Online Tool Tells You
Can you guess which author spent the most time on ‘The New York Times’ bestseller list? (Hint: It isn't J.K. Rowling or Stephen King.)