Title: John von Neumann.
Question: What was Von Neumann's mother's name?

Title: Digimon.
Question: What did Ken do in order to atone for his mistakes?

Title: History of science.
Question: Having a surplus of food allowed farmers and hunter-gatherers to spend less time working on what?

Title: Airport.
Question:
What instruments do pilots use to find the runway and fly the correct approach, even if they cannot see the ground?