Questions asked by Ricardo A.

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• Is t here a way to mark a question as a duplicate of another?
  
• I've seen that Anaxagoras (500 BCE–428 BCE) was the first to propose that the Moon reflects the Sun's light, but when was that assertion first scientifically proven, and who did it?
  
• What happened to the option "mark as duplicate" in the edit question dropdown? I no longer see it.