A man from a small village in Africa was in New York City, to attend a business meeting.

While he was waiting in the lobby of the office building, he saw a middle-aged woman approach a set of double doors and press a button next to them. Soon the doors slid open, and the woman walked through. Then the doors closed. A minute later, the doors opened again, and a young woman stepped out.

"We need a device like that for our village," said the African visitor to himself.