ABSTRACT
The world is bigger than anything we can see, hear, and feel, and most of it is hidden from us. Eyesight and temperature through electromagnetic waves, hearing through mechanical waves, touch and heat through vibrational sensing, and smell and taste possibly with the aid of molecular vibrations. In the 1660s the first microscope showed that plants and animals consist of cells. Classical physics is largely about the world that our natural senses register. It is the familiar world where apples fall from trees and the planets follow their orbits around the sun. Quantum physics, or quantum mechanics, deals with how the smallest parts of matter interact with each other, an aspect of our environment beyond the capabilities of our senses.
