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  2. Rope-burning puzzle - Wikipedia

    en.wikipedia.org/wiki/Rope-burning_puzzle

    One solution to this problem is to perform the following steps: [3] Light one end of the first fuse, and both ends of the second fuse. Once the second fuse has burned out, 30 seconds have elapsed, and there are 30 seconds of burn time left on the first fuse. Light the other end of the first fuse. Once the first fuse burns out, 45 seconds have ...

  3. Light Up (puzzle) - Wikipedia

    en.wikipedia.org/wiki/Light_Up_(puzzle)

    A typical starting point in the solution of a Light Up puzzle is to find a black cell with a 4, or a cell with a smaller number that is blocked on one or more sides (for example, a 3 against a wall or a 2 in a corner) and therefore has only one configuration of surrounding bulbs. After this step, other numbered cells may be illuminated on one ...

  4. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  5. Triboluminescence - Wikipedia

    en.wikipedia.org/wiki/Triboluminescence

    It is the emission of light from the fracture (rather than rubbing) of a crystal, but fracturing often occurs with rubbing. Depending upon the atomic and molecular composition of the crystal, when the crystal fractures, a charge separation can occur, making one side of the fractured crystal positively charged and the other side negatively charged.

  6. Balance puzzle - Wikipedia

    en.wikipedia.org/wiki/Balance_puzzle

    1) Subdivide the coins in to 2 groups of 4 coins and a third group with the remaining 5 coins. 2) Test 1, Test the 2 groups of 4 coins against each other: a. If the coins balance, the odd coin is in the population of 5 and proceed to test 2a. b. The odd coin is among the population of 8 coins, proceed in the same way as in the 12 coins problem.

  7. Olbers's paradox - Wikipedia

    en.wikipedia.org/wiki/Olbers's_Paradox

    That is, the light of each shell adds to the total amount. Thus the more shells, the more light; and with infinitely many shells, there would be a bright night sky. While dark clouds could obstruct the light, these clouds would heat up, until they were as hot as the stars, and then radiate the same amount of light.

  8. Glow stick - Wikipedia

    en.wikipedia.org/wiki/Glow_stick

    For example, in the mining industry, glow sticks are required for emergency evacuation in the case of a gas leak. Use of an electric light source in this case may cause an unintended explosion. Chemiluminescence, the type of light used in glow sticks, is a "cold-light" and does not use electricity, and will not cause a gas leak to ignite.

  9. Dim - Wikipedia

    en.wikipedia.org/wiki/Dim

    The abbreviation dim may refer to: Dimension , a measure of how many parameters is sufficient to describe an object in mathematics Dimension (vector space) , the number of vectors needed to describe the basis in a vector space, in linear algebra