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• How many 7's are there in the numbers from 1 to 999,999?

  Asked by LostInParadise | 17 responses

• What do you think of this solution to Newcomb's Paradox?

  Asked by LostInParadise | 24 responses

• Can you find the fallacy in this inductive argument that all things are the same?

  Asked by LostInParadise | 3 responses

• Can you explain why Marilyn vos Savant was wrong?

  Asked by LostInParadise | 10 responses

• Can you solve this math problem, which is much simpler than it may at first appear?

  Asked by LostInParadise | 7 responses

• Which of these do you prefer? (ethics question)

  Asked by weeveeship | 17 responses

• Help! I've been kidnapped! Can anyone get me home?

  Asked by Jonesn4burgers | 40 responses

• Does anybody like cryptograms?

  Asked by Jonesn4burgers | 32 responses

• If the only thing constant is change, when will that change?

  Asked by ETpro | 16 responses

• Can you solve this easy brain teaser?

  Asked by LostInParadise | 17 responses

• Could you help me solve the puzzle of the mysterious tulips?

  Asked by LornaLove | 13 responses

• Can you solve this matchstick triangle problem?

  Asked by LostInParadise | 3 responses

• For two planets orbiting the sun, do you see why it makes sense to speak of the planets as revolving around each other?

  Asked by LostInParadise | 21 responses

• Is there a user-friendly program that lets you diagram sentences on the computer?

  Asked by RandomGirl | 3 responses

• Can you find the slick solution to this geometry problem?

  Asked by LostInParadise | 5 responses

• Can you prove that this puzzle game is always solvable?

  Asked by PhiNotPi | 1 response

• Using only mental calculation, how closely can you approximate 89/99 as a decimal?

  Asked by LostInParadise | 20 responses

• Do you love a puzzle?

  Asked by TheProfoundPorcupine | 19 responses

• Can you solve this diabolical combination lock problem?

  Asked by LostInParadise | 12 responses

• Can you find a way of reducing this word puzzle to a manageable size?

  Asked by LostInParadise | 4 responses

• Any good or decent brain games you'd recommend?

  Asked by AshlynM | 15 responses

• What is your best Sudoku strategy?

  Asked by 2davidc8 | 9 responses

• For those of you who know combinatorics, can you solve this problem?

  Asked by LostInParadise | 6 responses

• Can you solve this Russian nested doll problem?

  Asked by LostInParadise | 17 responses

• What are some funny or unusual sounding acronyms you have seen?

  Asked by AshlynM | 14 responses

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