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Describe the common characteristics of several methods of checking material hardness.
Stem Cells
Undifferentiated cells capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.
Neurons
Specialized cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells, primarily through electrical and chemical signals.
Neurogenesis
The process by which new neurons are formed in the brain, contributing to brain plasticity and potentially to aspects of learning and memory.
Nicotine
A stimulant and addictive substance found in tobacco, known for its effects on the central nervous system.
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