How is it possible to ask a question that was already asked when a user cannot have read ALL of the questions on this site in one day?

It's impossible to have read every single question on this website in one day, or at all. So it may be two people saw the same news cast, then they both asked a question about it on this website.
Another user accused me of asking the same question someone asked three days ago. I guess she can memorize all of the questions asked on this website from three days ago because I sure can't 🤷🏼‍♀️
How is it possible to ask a question that was already asked when a user cannot have read ALL of the questions on this site in one day?
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