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This Spinning Toy Gives a Sense of Motion to a Viewer

question 23

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This spinning toy gives a sense of motion to a viewer when he or she looks through small slits in its cylindrical drum at a strip of changing pictures.


Definitions:

Structure

The arrangement or organization of constituent parts of a system or object, often determining its function and behavior.

Healthy People 2020

A set of health objectives for the nation to achieve over the first decade of the 21st century, aimed at improving the health of all Americans.

Life Expectancy

The average period that a person may expect to live.

Health Care Costs

The expenses associated with the delivery of health care services, including treatment, medication, and hospitalization.

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