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).
For 2018, the contribution limit for self-only HSAs is $3,450 per year. The contribution limit for family coverage HSAs is $6,900 per year. If you're age 55 or older, you can make an additional $1,000 catch-up contribution to your HSA.