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.
Itâs Not Too Late to Maximize Your 2016 HSA Contributions: Contribute Until April 17, 2017. One of the big pros of enrolling in a high-deductible health plan is that it is paired with a Health Savings Account (HSA).
The money in your HSA account can also be invested in stocks and bonds and the investment gains you earn are not taxed as long as you use them for qualified medical expenses. There are limits to how much you can contribute each year. This year, the maximum contribution amount is $3,400 for individuals and $6,750 for families. If you are 55 or older you can contribute $1,000 extra each year.