If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out intricate patterns using the pens and gears of a Spirograph kit. Simple as those parts may be, they’re actually a very ...

If you’ve ever made designs with a Spirograph, you can probably conjure up the feeling of swirling the gearlike wheel inside the plastic ring using the tip of a pen — and also recall being amazed at ...

The Epson ET-2980 is a great value at its full price, and the discount sweetens the deal. Two Titanic Structures Hidden Deep Within the Earth Have Altered the Magnetic Field for Millions of Years A ...

Remember the Spirograph toys you had when you were a kid, which let you draw mathematically precise hypotrochoids and epitrochoids (or, as I called them, “neat shapes”) without cracking a sweat? What ...