Examlex
Through hydrogen fusion, the Sun loses approximately 4 million metric tons of mass each second.
If it burns hydrogen at this rate for 10 billion years, what percentage of its original mass will it
lose in all? (Note: The mass of the Sun is 1.99*1030 kg, and 1 metric ton=1,000 kg.)
Scaffold
A support structure or framework that is temporarily used to support people or materials in the construction or repair of buildings and other large structures.
Preoperational Stage
In Piaget’s theory, the stage (from about 2 to 6 or 7 years of age) during which a child learns to use language but does not yet comprehend the mental operations of concrete logic.
Neural Network
A computational model designed to simulate the way the human brain analyzes and processes information, utilizing interconnected nodes or neurons in a layered structure.
Critical Period
An optimal period shortly after birth when an organism’s exposure to certain stimuli or experiences produces proper development.
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