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- 147 If the astronauts on Apollo 11 had landed safely on the moon but could not take off, would there have been a rescue mission?
- 36 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?
- 30 What is the purpose of these diversions in a natural gas line?
- 29 What's causing this high SO2 concentrations in Kazakhstan?
- 27 Why did Peter the Great name Saint Petersburg, Russia with a foreign styled name?
- 24 Is it possible for rivers to freeze completely and stop flowing?
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