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  2. String girdling Earth - Wikipedia

    en.wikipedia.org/wiki/String_girdling_Earth

    Surprisingly, the answer is 2 π m or around 6.3 metres (21 ft). In the second phrasing, considering that 1 metre (3 ft 3 in) is almost negligible compared with the 40,000 km (25,000 mi) circumference, the first response may be that the new position of the string will be no different from the original surface-hugging position.

  3. Four Hang; Two Point the Way - Wikipedia

    en.wikipedia.org/wiki/Four_Hang;_Two_Point_the_Way

    Four Hang; Two Point the Way is the name given by the folklorist Archer Taylor to a traditional riddle-type noted for its wide international distribution.The most common solution is 'cow', and in Taylor's view 'we can probably infer that a cow was the original answer'.

  4. Famous Trick Donkeys - Wikipedia

    en.wikipedia.org/wiki/Famous_Trick_Donkeys

    Famous Trick Donkeys is a puzzle invented by Sam Loyd in 1858, [1] first printed on a card supposed to promote P.T. Barnum's circus. At that time, the puzzle was first called "P.T. Barnum's trick mules". [2] Millions of cards were sold, with an estimated income for Sam Loyd of $10,000 from 1871 [3] —more than $200,000 in 2023 dollars. [4]

  5. 78 Riddles for Adults That Will Test Your Smarts - AOL

    www.aol.com/lifestyle/78-riddles-adults-test...

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  6. Maze: Solve the World's Most Challenging Puzzle - Wikipedia

    en.wikipedia.org/wiki/MAZE:_Solve_the_World's...

    With this structure established, Manson challenges readers to solve three tasks: to journey from Room #1 to Room #45 and back to Room #1 in only sixteen steps, to interpret the riddle hidden in Room #45 based on visual and verbal clues, and to find the solution to this riddle hidden along the shortest possible path found in the first task.

  7. 'There's a Woman in a Boat' Riddle - AOL

    www.aol.com/viral-theres-woman-boat-riddle...

    The reason why this particular riddle went viral is simple: it’s short and leaves you searching for the answer in all the wrong places. The riddle does a great job because the name is a play on ...

  8. Five-room puzzle - Wikipedia

    en.wikipedia.org/wiki/Five-room_puzzle

    That is, we proceed as if a solution exists and discover some properties of all solutions. These put us in an impossible situation and thus we have to conclude that we were wrong—there is no solution after all. [3] Imagine that there is an "observer" in each "room". The observer can see the solution line when it is in his room, but not otherwise.

  9. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    [2] MU puzzle – Transform the string MI to MU according to a set of rules. [3] Mutilated chessboard problem – Place 31 dominoes of size 2×1 on a chessboard with two opposite corners removed. [4] Coloring the edges of the Petersen graph with three colors. [5]