【简答题】My l4-year-old son, John, and I spotted the coat at the same time in a second-hand clothing store. It stood out among big and old coats. It had beautiful tailoring and an unbelievable price: $28. I lo...
【简答题】John von Neumann was the oldest of 3 children of an banker, and his speed of learning new ideas and solving problems stood out early. At 17, his father tired to persuade him not to become a mathematic...