Explore the clever mechanics behind pulleys in Jiwi's Machines Episode 2. Discover how simple systems create powerful movements in this exciting Science Extra feature. US Army leadership says it ...

If you buy something via one of our links, we may earn a commission. The Pooboo Under Desk Electric Elliptical Machine is on sale at Walmart for just $100, down from its original price of $300.

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

From big brands like NordicTrack and Bowflex, to more affordable options like JTX Fitness, these are our picks of the best elliptical machines.