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Holiday
Any day fixed by law, custom or religion on which day-to-day business is suspended for the celebration or commemmoration of some event or public figure.
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granny ring
Sports; Bicycle & electric bicycle
the smallest of the three chainrings on a triple chainring.
Clean Air Act Amendments of 1990
Energy; Coal
Originally passed by the U.S. congress in 1963, it was amended in 1970 and 1990. The 1990 amendment addressed issues such as emissions trading, acid rain, ozone depletion.
twisting
Financial services; General Finance
Convincing a customer that trades are necessary in order to generate a commission. This is an unethical practice.
retrograde motion
Astronomy; Mars
Backward (westward) motion of the planet among the stars, resulting from the fact that it is viewed from the moving earth. It is the motion that a planet has when its right ...
active optics
Astronomy; General astronomy
Controlling the shape of a telescope mirror at a relatively slow rate.