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).
Each year, the IRS sets a maximum limit for HSA contributions. To see the maximum limit for this year, go to our HSA Contributions page. The IRS also allows individuals who are age 55 and older to make catch-up contributions. Learn more on our HSA Contributions page.