The "Find The Heavier Ball" Brainteaser
How do you find the heavier ball amongst these 12 using the scale only 3 times?
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How Many Quarters Would It Take To Stack Them Floor to Ceiling?
Believe it or not, there is a logic to asking this question that I am not going to get into.  
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You go to a party with a friend. There are 10 people there including you and your friend.  Your friend makes you a bet. 
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How Many Points Are There on Earth Where You Can Travel . . . ?
How many points are there on earth where you can travel 1 mile south, then 1 mile east, then 1 mile north, and end up in the same spot you started in? 
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You can't just sit there and have a mental column in your head and start going, "one, 3,6, 10 …" There is just no time for that. 
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