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Engineering

The discipline, art, skill and profession of applying scientific knowledge and principles to the design and manufacturing of machines, structures, devices, systems, materials and processes.

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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.

homosporous

Plants; Flowers

Producing only one size or kind of spore.

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