The American Cream Draft is a rare draft horsebreed, the only such breed developed in the United States that is still in existence. It is recognized by its cream color, known as "gold champagne", produced by the action of the champagne gene upon a chestnut base color, and by its amber eyes, also characteristic of the gene; the only other color found in the breed is chestnut. Like several other breeds of draft horses, the American Cream is at risk for the autosomal recessive genetic disease junctional epidermolysis bullosa. The breed was developed in Iowa during the early 20th century, beginning with a cream-colored mare named Old Granny. The Great Depression threatened the breed's existence, but several breeders worked to improve the color and type of the breed, and in 1944 a breed registry was formed. The mechanization of farming in the mid-20th century led to a decrease in the breed's population and the registry became inactive for several decades. It was reactivated in 1982 and population numbers have slowly grown since then. However, population numbers are still considered critical by The Livestock Conservancy and the Equus Survival Trust. (Full article...)
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The pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key.
Without a key in the lock, the driver pins (blue) are pushed downwards, preventing the plug (yellow) from rotating.
When an incorrect key is inserted into the lock, the key pins (red) and driver pins do not align with the shear line; therefore, it does not allow the plug to rotate.
When the correct key is inserted, the gaps between the key pins and driver pins align with the edge of the plug.
With the gaps between the pins aligned with the shear line, the plug can rotate freely.
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