99% Invisible

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.Click here to get the book! Available for pre-order at W. W. Norton in the US and Bookshop.org in the UK.Nuts and Bolts