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  2. Subtraction game - Wikipedia

    en.wikipedia.org/wiki/Subtraction_game

    Subtraction games are generally impartial games, meaning that the set of moves available in a given position does not depend on the player whose turn it is to move.For such a game, the states can be divided up into -positions (positions in which the previous player, who just moved, is winning) and -positions (positions in which the next player to move is winning), and an optimal game playing ...

  3. Save American wetlands with this student-made Facebook game - AOL

    www.aol.com/news/2012-01-19-uwb-wetlands...

    This Facebook game built by college students teaches about wetlands better than Zynga's FarmVille can teach about farming. Not surprising, seeing that its chief goal is to educate. But ...

  4. Wetland conservation - Wikipedia

    en.wikipedia.org/wiki/Wetland_conservation

    A wetland (aerial view) Wetland conservation is aimed at protecting and preserving areas of land including marshes, swamps, bogs, and fens that are covered by water seasonally or permanently due to a variety of threats from both natural and anthropogenic hazards. Some examples of these hazards include habitat loss, pollution, and invasive species.

  5. Wythoff's game - Wikipedia

    en.wikipedia.org/wiki/Wythoff's_game

    Wythoff's game is a two-player mathematical subtraction game, played with two piles of counters. Players take turns removing counters from one or both piles; when removing counters from both piles, the numbers of counters removed from each pile must be equal. The game ends when one player removes the last counter or counters, thus winning.

  6. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into 70 + 16 − 39 {\displaystyle 70+16-39} .

  7. Subtract a square - Wikipedia

    en.wikipedia.org/wiki/Subtract_a_square

    A normal play game starting with 13 coins is a win for the first player provided they start with a subtraction of 1: player 1: 13 - 1*1 = 12 Player 2 now has three choices: subtract 1, 4 or 9. In each of these cases, player 1 can ensure that within a few moves the number 2 gets passed on to player 2:

  8. Wetlands of the United States - Wikipedia

    en.wikipedia.org/wiki/Wetlands_of_the_United_States

    The Wetlands Geodatabase and the Wetlands Mapper, as an Internet discovery portal, provide technological tools that allow the integration of large relational databases with spatial information and map-like displays. The information is made available to an array of federal, state, tribal, and local governments and the public.

  9. Flocabulary - Wikipedia

    en.wikipedia.org/wiki/Flocabulary

    Flocabulary is a Brooklyn-based company that creates educational hip hop songs, videos and additional materials for students in grades K-12. [1] Founded in 2004 by Blake Harrison and Alex Rappaport, the company takes a nontraditional approach to teaching vocabulary, United States history, math, science and other subjects by integrating content into recorded raps.