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  2. The old axiom is that 90% of a tree’s roots are in the top foot of soil. To some degree, they mirror the limb growth. Branches of most trees are relatively horizontal, live oaks being a classic ...

  3. List of NP-complete problems - Wikipedia

    en.wikipedia.org/wiki/List_of_NP-complete_problems

    Minimum degree spanning tree; Minimum k-cut; Minimum k-spanning tree; Minor testing (checking whether an input graph contains an input graph as a minor); the same holds with topological minors; Steiner tree, or Minimum spanning tree for a subset of the vertices of a graph. [2] (The minimum spanning tree for an entire graph is solvable in ...

  4. Stern–Brocot tree - Wikipedia

    en.wikipedia.org/wiki/Stern–Brocot_tree

    In number theory, the Stern–Brocot tree is an infinite complete binary tree in which the vertices correspond one-for-one to the positive rational numbers, whose values are ordered from the left to the right as in a binary search tree. The Stern–Brocot tree was introduced independently by Moritz Stern and Achille Brocot .

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  6. Christmas Trivia: 50 Fun Questions with Answers - AOL

    www.aol.com/christmas-trivia-50-fun-questions...

    50 Fun Christmas Trivia Questions. Question: ... Question: What do people traditionally put on top of a Christmas tree? Answer: An angel. Question: In Home Alone, ...

  7. 50 Science Trivia Questions People Always Get Wrong - AOL

    www.aol.com/50-science-trivia-questions-people...

    If you can answer 50 percent of these science trivia questions correctly, you may be a genius. The post 50 Science Trivia Questions People Always Get Wrong appeared first on Reader's Digest.

  8. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  9. 50 Trick Questions Guaranteed to Leave You Stumped

    www.aol.com/50-trick-questions-guaranteed-leave...

    Put on your thinking cap and try answering as many of these trick questions as you can! The post 50 Trick Questions Guaranteed to Leave You Stumped appeared first on Reader's Digest.