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Answers
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Not especially famous, long-open problems which anyone can understand (2)
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Means of Promoting Mathematics in Young Countries!
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What is the protocol for making modifications to someone else’s proof to prove something slightly stronger?
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covering disks with smaller disks
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Favorite popular math book
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Mathematical habits of thought and action which would be of use to non-mathematicians
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Is there evidence whether undergraduate math courses improve problem-solving?
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Demystifying complex numbers
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Dense orbits in billiards
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Lecture on Fractals for Middle School Students
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Where to submit (relatively) easy solutions to known problems?
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Discrete Mathematics textbooks for undergraduates
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Polygonal billards programs
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Undergraduate Probability Topics