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The wagon-wheel effect (alternatively called stagecoach-wheel effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it can appear to rotate in the opposite direction from the true rotation ...
Colour distribution of a Newton disk. The Newton disk, also known as the disappearing color disk, is a well-known physics experiment with a rotating disk with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet, commonly known by the abbreviation ROYGBIV) appearing as white (or off-white or grey) when it's spun rapidly about its axis.
If flown, this would add a centrifuge sleep quarters module to the ISS. This makes it possible to experiment with artificial gravity without destroying the usefulness of the ISS for zero g experiments. It could lead to deep space missions under full g in centrifuge sleeping quarters following the same approach. [citation needed]
The spinning pinwheel is a type of throbber and a variation of the mouse pointer used in Apple's macOS to indicate that an application is busy. [ 1 ] Officially, the macOS Human Interface Guidelines refer to it as the spinning wait cursor , [ 2 ] but it is also known by other names.
A policeman stands guard before the court's verdict in the country's biggest ever drug trafficking trial at Brussels correctional court, at Justitia, in Brussels, on October 29, 2024.
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The National Hurricane Center said Wednesday it is continuing to track a system in the Caribbean that could strengthen into Hurricane Sara by next week.
A zoetrope is a pre-film animation device that produces the illusion of motion, by displaying a sequence of drawings or photographs showing progressive phases of that motion. A zoetrope is a cylindrical variant of the phénakisticope , an apparatus suggested after the stroboscopic discs were introduced in 1833.