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  2. Invert error - Wikipedia

    en.wikipedia.org/wiki/Invert_error

    In 2013 the U. S. Postal Service offered a six-stamp souvenir sheet commemorating the famous Inverted Jenny issue. These stamps replicated the famous upside-down airplane image, but did not duplicate the original 24¢ denomination, instead being valued at $2.

  3. Flipped image - Wikipedia

    en.wikipedia.org/wiki/Flipped_image

    Many large format cameras present the image of the scene being photographed as a flipped image through their viewfinders. Some photographers regard this as a beneficial feature, as the unfamiliarity of the format allows them to compose the elements of the picture properly without being distracted by the actual contents of the scene.

  4. Keystone effect - Wikipedia

    en.wikipedia.org/wiki/Keystone_effect

    The problem arises for screen projectors that don't have the depth of focus necessary to keep all lines (from top to bottom) focused at the same time. Common solutions to this problem are: moving the projector more to the center of the screen, tilting the screen in a small angle, the use of special software on the projector

  5. 9 misprints that are worth a ton of money. Do you have a copy?

    www.aol.com/news/2010-05-03-9-misprints-that-are...

    Where to shop today's best deals: Kate Spade, Amazon, Walmart and more

  6. Colon cancer: Measuring ‘biological age’ may help predict who ...

    www.aol.com/colon-cancer-measuring-biological...

    One’s biological age, which measures the body’s physiological state, may help predict who is at risk for developing colon polyps, a known risk factor for colorectal cancer.

  7. Four glasses puzzle - Wikipedia

    en.wikipedia.org/wiki/Four_glasses_puzzle

    Four glasses or tumblers are placed on the corners of a square Lazy Susan.Some of the glasses are upright (up) and some upside-down (down). A blindfolded person is seated next to the Lazy Susan and is required to re-arrange the glasses so that they are all up or all down, either arrangement being acceptable, which will be signalled by the ringing of a bell.

  8. Catholic nun arrested for bringing mafia messages to prisoners

    www.aol.com/catholic-nun-arrested-bringing-mafia...

    A Catholic nun was arrested by Italian police on Thursday for bringing messages for the mafia to prisoners, police said in a news statement. Sister Anna Donelli acted on several occasions as an ...

  9. Head and shoulders (chart pattern) - Wikipedia

    en.wikipedia.org/wiki/Head_and_shoulders_(chart...

    The formation is upside down and the volume pattern is different from a head and shoulder top. Prices move up from first low with increase volume up to a level to complete the left shoulder formation and then fall down to a new low. A recovery move follows that is marked by somewhat more volume than seen before to complete the head formation.