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To Create His Geometric Artwork, M.C. Escher Had to Learn Math the Hard Way
"It's rather an amazing story that he did this all on his own," a mathematician tells us.
Why Some People Believe the 'Black Knight' Satellite Is an Alien Spacecraft
Some believe it's an extraterrestrial spacecraft. NASA says it's probably just space junk. Here are the facts.
The Best At-Home Solutions for Wildfire Smoke
Whether buying an air purifier or creating your own DIY filter, there are ways to protect yourself.
Sorry Russia, But Your Machine Guns Can't Kill the M1A1 Abrams Tanks in Ukraine
We're addressing the tank's various weaknesses—at least, according to Russian propaganda—point by point.
Ukrainian Soldiers Must Breach the Most Formidable Military Fortifications Since WWII
From "tank traps" to layers of barbed wire, the 600-mile-long frontline of the Russo-Ukrainian War is remorseless. Our reporter went on the ground with a brigade training to breach it.
Why Russia, China, and the U.S. Are Suddenly Expanding Their Nuclear Weapons Test Sites
No one wants to be the first to test a nuclear weapon, but everyone wants to be second.
The 5 Most Important Planes of World War II Might Surprise You
One groundbreaking plane spurred the death of the radial engine, another was christened by a king.
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