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  2. Möbius strip - Wikipedia

    en.wikipedia.org/wiki/Möbius_strip

    The Möbius strip has several curious properties. It is a non-orientable surface: if an asymmetric two-dimensional object slides one time around the strip, it returns to its starting position as its mirror image. In particular, a curved arrow pointing clockwise (↻) would return as an arrow pointing counterclockwise (↺), implying that ...

  3. Non-orientable wormhole - Wikipedia

    en.wikipedia.org/wiki/Non-orientable_wormhole

    The space that this male fiddler crab (a chiral object) lives in, a Möbius strip, is non-orientable. Note that the fiddler crab flips to being its own mirror image with every complete circulation. In wormhole theory, a non-orientable wormhole is a wormhole connection that appears to reverse the chirality of anything passed through it.

  4. Klein bottle - Wikipedia

    en.wikipedia.org/wiki/Klein_bottle

    A two-dimensional representation of the Klein bottle immersed in three-dimensional space. In mathematics, the Klein bottle (/ ˈ k l aɪ n /) is an example of a non-orientable surface; that is, informally, a one-sided surface which, if traveled upon, could be followed back to the point of origin while flipping the traveler upside down.

  5. Orientability - Wikipedia

    en.wikipedia.org/wiki/Orientability

    A torus is an orientable surface The Möbius strip is a non-orientable surface. Note how the disk flips with every loop. The Roman surface is non-orientable.. In mathematics, orientability is a property of some topological spaces such as real vector spaces, Euclidean spaces, surfaces, and more generally manifolds that allows a consistent definition of "clockwise" and "anticlockwise". [1]

  6. Solid Klein bottle - Wikipedia

    en.wikipedia.org/wiki/Solid_Klein_bottle

    In mathematics, a solid Klein bottle is a three-dimensional topological space (a 3-manifold) whose boundary is the Klein bottle. [1]It is homeomorphic to the quotient space obtained by gluing the top disk of a cylinder to the bottom disk by a reflection across a diameter of the disk.

  7. Hardline Republicans reject Trump's debt ceiling demand ... - AOL

    www.aol.com/news/hardline-republicans-reject...

    Republican hardliners who normally are ardent supporters of President-elect Donald Trump are resisting his push to raise the U.S. debt ceiling, sticking to their belief that government spending ...

  8. Portal:Mathematics/Featured picture archive - Wikipedia

    en.wikipedia.org/wiki/Portal:Mathematics/...

    The hairy ball theorem of algebraic topology proves that whenever one attempts to comb a hairy ball flat, there will always be at least one tuft of hair at one point on the ball. More precisely, it states that there is no nonvanishing continuous tangent- vector field on an even-dimensional n‑sphere (an ordinary sphere in three-dimensional ...

  9. ‘Fear’ by Huffington Post

    testkitchen.huffingtonpost.com/flip-side-of-fear

    In “The Flip Side of Fear”, we look at some common phobias, like sharks and flying, but also bats, germs and strangers. We tried to identify the origin of these fears and why they continue to exist when logic tells us they shouldn’t.