publication date: Thursday, July 23, 2020 (part of Summer 2020)
clue: When his friend invented soft-serve ice cream, he knew it would be a best-seller in his royal restaurant when he couldn't give it away fast enough.
explanation: Noble founded Dairy Queen. His first attempt at soft-serve was an "all you can eat for 10 cents" promotion; he sold 1600 servings in the first two hours. more…
intended difficulty: medium