In her new book Nuts and Bolts Seven Small Inventions That Changed the World (in a Big Way), structural engineer Roma Agrawal identifies and examines the seven of most basic building blocks of engineering that have shaped the modern world: the nail, the wheel, the spring, the lens, the magnet, the string, and the pump.

Some of engineering’s mightiest achievements are small in scale, even hidden—and yet, without them, the complex machinery on which our modern world runs would not exist.

“From the physics behind both Roman nails and modern skyscrapers to rudimentary springs that inspired lithium batteries, Agrawal shows us how even the most sophisticated items are built on the foundations of these ancient and fundamental breakthroughs in engineering.”

Source: Nuts and Bolts – 99% Invisible