What happens once every minute, twice every millennium, but never in a hundred years?
The letter M.
Once Every Minute
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The answer to this brain-buster is the letter "M." It shows up once in "minute," twice in "millennium," and not at all in "hundred years." I know it's hard for you because you probably think a millennium is a type of falcon, but try to keep up.