What is the most amazing invention of the century?
My husband answers that often-asked question with this joke:
When a fellow was asked to name the most amazing invention, he surprised others by answering: "The thermos."
"What's so amazing about a thermos?" he was asked.
"Well, if you put hot stuff in it, it stays hot. If you put cold stuff in it, it stays cold," he said.
"What's so amazing about that?" asked his companion.
"Well, how does it know?" the man said.