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- 152 If the astronauts on Apollo 11 had landed safely on the moon but could not take off, would there have been a rescue mission?
- 71 Why did Roosevelt and Churchill use voice-based telecommunication, instead of simpler text-based options which were easier to encrypt?
- 40 Why weren't pickled fruits and vegetables part of (European) rations during the Age of Sail?
- 37 Why doesn't the sun reach its highest point overhead at exactly 12:00 noon?
- 32 Why does the Channel Tunnel enter the ground around 10 km from the coast?
- 32 What is the purpose of these diversions in a natural gas line?
- 29 What's causing this high SO2 concentrations in Kazakhstan?
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