We Spent All Day Arguing About This Triangle Brain Teaser

Mathematicians reveal the real answer. See if you're right.

View in Browser  SHOP EXCLUSIVE SUBSCRIBE TOP STORIES WE CHOSE FOR YOU We Spent All Day Arguing About This Triangle Brain Teaser Mathematicians reveal the real answer. See if you're right. Read More The U.S. Navy Wants Autonomous Fighter Jets, But First It Needs to Trust AI The Navy predicts that up to 60 percent of its future carrier air wing will consist of drones. But is it ready to put its confidence in AI? Read More Humans Will Break the Longevity Record and Live Past 122, Study Says "If there is a maximum limit to the human lifespan, we are not yet approaching it." Read More We Tried the Best Indoor Security Cameras to Keep Your Home, Pets, and Kids Safe and Watched Over We tried the top-rated indoor security cameras to find the best options for keeping a close watch on your kids and pets, no matter where you are. Read More This Snow Peak Titanium Spork Is the Only Utensil You Need Sleek, smooth, and nearly indestructible, this spork is beloved by our editors. Read More Treasure Hunters May Have Found Jesse James's Lost Gold The legendary treasure could be worth tens of millions—if the team can dig it out of the ground. Read More WATCH OUR LATEST VIDEOS We're Not Ready for Self-Driving Cars Watch Now The History of the M777 Howitzer Watch Now Follow Us Unsubscribe | Privacy Notice/Notice at Collection PopularMechanics.com ©2023 Hearst Magazine Media, Inc. All Rights Reserved. Hearst Magazines, 300 West 57th Street, New York, NY 10019