Archimedes was a wise man who lived in Greece long, long ago. He was so wise that even the king was his friend.
one day the king asked him, "How do you like my new crown? It's all gold.
The king stopped. "That is, I think it's all gold," he said. "I gave a man gold to make this crown. But I think he may have kept some of it. To make up for what he took, he may have added silver.