The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong

Roman concrete can self-heal cracks before they spread. An expert tells us the chemistry behind it. [View in Browser]( [Popular Mechanics]( [SHOP]( [EXCLUSIVE]( [SUBSCRIBE]( [The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong]( [The Secret Reason Why Ancient Roman Concrete Is So Remarkably Strong]( Roman concrete can self-heal cracks before they spread. An expert tells us the chemistry behind it. [Read More]( [This Backyard Bar Is Ready for Your Party Tonight]( [This Backyard Bar Is Ready for Your Party Tonight]( Installing it literally takes minutes. [Read More]( [Alternate text] [Alternate text] [Turn It Up! The Best Car Speakers of 2023, According to an Expert]( [Turn It Up! The Best Car Speakers of 2023, According to an Expert]( Looking for aftermarket car speakers? We spoke with a car audio expert to get some insight into the best of the best—plus a few personal recommendations on how to take your car stereo to the next level. [Read More]( [Future Electric Vehicles Coming 2023-2028]( Future Electric Vehicles Coming 2023-2028]( There are dozens of new electric cars, trucks, and SUVs on the horizon. [Read More]( [Alternate text] [Alternate text] [The Best Dash Cams You Can Buy in 2023]( [The Best Dash Cams You Can Buy in 2023]( Get the lowdown on dash cams at a variety of price points with a range of features that can document your vehicle's every move in traffic. Just in case. [Read More]( [The Universe May Be a Hologram, Meaning Our Entire Reality Could Be an Illusion]( [The Universe May Be a Hologram, Meaning Our Entire Reality Could Be an Illusion]( This holographic concept could explain a mystery about black holes, but the math may not represent reality. [Read More]( [Alternate text] [90-Day Transformation Challenge: Abs]( 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