This puzzle originally appeared in Spektrum der Wissenschaft and was reproduced with permission. We’d love to hear from you!

You could always schedule a professional treatment with your dentist, but today's at-home options work surprisingly well, and they come at a fraction ... tested. Strips are mess-free and portable ...

U.S. government-issued Treasury Strips are unique, safe investments that hold the most appeal when interest rates are declining.

Girl math is realizing that owning a digital luggage scale will help you avoid overweight baggage fees, so you'll have more ...

Love the look of freshly done nails, but hate the price of salon manicures? Great news! You don’t need to be a pro—or even ...

Throughout DC Comics' lifetime, the authors have created some of the most destructive weapons in the comic world. From ...

Fractions can be added in different ways ... help to build bridges and bring light back to the islands in this free game from BBC Bitesize.

Latrenda Knighten, the president-elect of the National Council of Teachers of Mathematics, agreed students can learn math ...

Dietitians share their favorite healthy, Whole30-compliant snacks, like eggs, olives, meat bars, plantains, dried coconut, ...

The cell also has metal strips that conduct the flow of electrons ... the boron-doped bottom layer—a process that occurs in a fraction of a second and only very close to the junction (the ...

It’s rare for WIRED to pronounce a new car an instant smash hit, but the all-electric Renault 5 ticks all the boxes.

Shop these deals ASAP on the Ninja Foodi Grill, Apple iPad, Clinique's Black Honey lip balm, Crest Whitestrips and more.