What Is Matter? Matter vs. Mass, Explained
extremetech.comAt the end of a lecture on astronomy, describing how the planets orbit the Sun, a little old lady at the back of the room stood up and said: "What you've told us is all rubbish. The world is really a flat crust of earth supported on the back of a giant tortoise."
The lecturer frowned and replied, "But then, madam, what is the tortoise standing on?"
"You're very clever, young man, very clever," said the old lady. "But it's no use. It's turtles all the way down!"
Young people, and the young at heart, ask great questions. But sometimes, the endless questions run into bigger answers than anyone expects. What's that tree made of? Leaves and bark, xylem and phloem, and cambium. What are those made of? Cells, molecules, carbon atoms. But what's an atom made of? What is matter, really?
Matter is ...
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