The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong

Roman concrete reached extremely high temperatures while it was mixed—well over 170 degrees Fahrenheit. How could that be? [View in Browser]( [Popular Mechanics]( [SHOP]( [EXCLUSIVE]( [SUBSCRIBE]( TOP STORIES WE CHOSE FOR YOU [The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong]( [The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong]( Roman concrete reached extremely high temperatures while it was mixed—well over 170 degrees Fahrenheit. How could that be? [Read More]( [Feast Your Eyes on the 30 Absolute Coolest Shipwrecks in the World]( [Feast Your Eyes on the 30 Absolute Coolest Shipwrecks in the World]( Grab your scuba gear, because we’re about to go deep—unless you suffer from thalassophobia. [Read More]( [Alternate text] [Alternate text] [Flying Saucers Are So 1947. This Is the New Shape of the Modern UFO]( [Flying Saucers Are So 1947. This Is the New Shape of the Modern UFO]( Fifty-two percent of American military UFO sightings are described as white or metallic spheres. So what are they? [Read More]( [Amazing New Details May Reveal Exactly What Happened the Night the Titanic Sank]( Amazing New Details May Reveal Exactly What Happened the Night the Titanic Sank]( There's still so much we don't know about how the ship met its fateful end. This breakthrough could fill in the holes. [Read More]( [Alternate text] [Alternate text] [Say Goodbye to Kinks With These Top-Rated Garden Hose Reels]( [Say Goodbye to Kinks With These Top-Rated Garden Hose Reels]( Upgrade your watering routine with an easy-to-use hose reel. [Read More]( [These Pool Filters Keep Your Water Clean, Clear, and Ready for Swimming]( [These Pool Filters Keep Your Water Clean, Clear, and Ready for Swimming]( A pool is only as good as its filter. [Read More]( WATCH OUR LATEST VIDEOS [The B-2 Can Carry a 20 Ton Payload 6,000 Miles without Refueling]( [The B-2 Can Carry a 20 Ton Payload 6,000 Miles without Refueling]( [Watch Now]( [Don’t Take Your Pliers for Granted. Watch How This Family-Owned Business Forges Them]( [Don’t Take Your Pliers for Granted. Watch How This Family-Owned Business Forges Them]( [Watch Now]( [Alternate text] [7-Minute Workouts That Burn Fat]( 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