Humans are made of billions of cells from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
It is a startling thought that every human being begins life as a single cell, a fertilized egg. From this tiny, undifferentiated blob comes everything that makes us human - the bones and blood, the muscles and brain. But the real wonder is not just that we start life this way, but that we continue to exist in this way. Indeed, for most of our lives, we are no more than a collection of cells. Each of us is made up of trillions of cells, each one carrying out its own particular function. The cells of the heart beat in unison, the cells of the brain transmit electrical signals, the cells of the skin protect us from harm. It is a complex and intricate system, a symphony of cells working together to create the miracle of human existence. And yet, despite t...
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