So next time you’re at the toilet, remember: one button press can actually help the planet. In 1596, Sir John Harington (godson of Queen Elizabeth I) invented an early version of the flush toilet.

The seat disk predates the Korky flapper, so your toilet must ... single-button, dual-flush toilets,” Barnes says. “This gives us the ability to have a No. 1 and a No. 2 flush without needing ...

The buttons on your toilet flush—why are there two buttons, a big one and a small one? Are you pressing the correct button, or just whichever feels right in the moment? Here’s the answer.

With military aircraft, we sometimes have a tendency to think of them mainly just in terms of how potent their arsenal is or how absurdly speedy they can be. The F-15E Strike Eagle variant, for ...

When you’re in shopping mode for a new toilet, remember that ... 3-, 3½-, or even 4-inch-wide flush valve deliver more thrust in our tests than those with a 2- to 2½-inch valve.