‘Nuts and Bolts’ showcases the 7 building blocks of modern engineering

Nuts and Bolts
Roma Agrawal
W.W. Norton & Co., $29.99

What do you get when you pose a challenge, weave in a cast of characters driven by hunger, frustration, curiosity, compassion or maybe even a little spite, and throw in a few twists and turns? A book about engineering.

In Nuts and Bolts, structural engineer Roma Agrawal offers an updated twist on the list of six basic machines — the lever, wheel and axle, pulley, inclined plane, wedge and screw — that Renaissance scientists and engineers identified as fundamental to that era’s technology. Seven elements, Agrawal argues, “form the basis of the modern world”: the nail, wheel, spring, magnet, lens, string

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