The auditory system changes a wide range of weak mechanical signals into a complex series of electrical signals in the central nervous system. Sound is a series of pressure changes in the air.
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enrolled in Medicare (on July 1, 2015). Thus, she will be eligible to make HSA contributions for six months in 2015 (January through June) at a monthly contribution limit of approximately $362 (1/12 of $3,350 (the statutory maximum) + 1/12 of $1,000 (the annual HSA catch-up limit)). Her maximum HSA contribution limit for 2015 is