Optical illusion puzzles have been there for centuries and these are fun challenges that are designed to play tricks on our eyes and brains. Optical illusions work on a simple principle where it ...

Optical illusions with hidden images can reveal if you are good at spotting minute details that most often overlook. These illusion images test your visual processing skills, attention to detail, and ...

A brain teaser is a short, playful puzzle designed to make your mind stretch and smile. It could be a riddle, a tricky question, a visual illusion, or a logic twist that nudges you to think beyond the ...

Lottery officials are hoping that tonight's drawing could finally turn someone into a billionaire. On Monday at 11pm EST, the game will once again spin 69 white balls and 26 red balls from its ...

Reaction wheels are useful things, typically used by satellites to keep themselves oriented the right way up in space. Turning the reaction wheel creates an equal and opposite torque in the spacecraft ...

Optical illusions with hidden images have fascinated scientists and puzzle lovers for centuries. These mind-bending optical illusion puzzles trick the brain, challenging how we perceive reality. What ...

For 5,000 years scholars, generals, and mystics have been fascinated by the Egyptian pyramids. That obsession persists in the modern age. Today the Pyramids of Giza are surrounded by desert. But 4,600 ...

The story of the highly skilled workers who helped build Egypt’s Great Pyramid is emerging from a papyrus cache unearthed at the world’s oldest harbor On a summer afternoon around 4,600 years ago, ...

Measuring—and delivering—what consumers really want by Eric Almquist, John Senior and Nicolas Bloch When customers evaluate a product or service, they weigh its perceived value against the asking ...

This story appears in the January/February 2017 issue of National Geographic History magazine. Amelia Blanford Edwards was one of a stream of European travelers drawn to see the wonders of Egypt at ...