What does a clock have in common with an electronic timer? They both rely on the principle of the oscillating pendulum.
Why is an electric toothbrush like a hotel keycard? They each use one coil to induce a current in another coil.
And how is an E-Z Pass system similar to a toaster? They both generate electromagnetic waves – thus the red glow of the toaster wires.
This book is organized around the story of a day. The author explains the physics behind the items that we use and take for granted. His explanations are clear and understandable – even for a reader who has no knowledge of physics.