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).
You make pretax contributions to an employer-sponsored HSA and your contributions are tax-deductible if you have an individual HSA. You can make tax-free withdrawals from your HSA for medical expenses at any time. Annual HSA contribution limits for 2017 are $3,400 for individuals and $6,750 for families.