MSMA (monosodium methanearsonate) is an arsenic-based grass killer. It kills grassy weeds such as crabgrass and goosegrass without harming most turfgrasses. It contains organic arsenic that, according to the University of Tennessee Extension, is less harmful than aspirin.
There are several styles of hearing aids available, from the smallest - Invisible in the Canal (IIC) to the largest and strongest - Power Behind the Ear (BTE), and the very popular Receiver in the Canal (RIC) - made to fit most hearing losses while remaining nearly unseen.
Hearing aids are tiny electronic devices that sit in or behind your ear. Hearing aids receive sound, process and amplify it, and deliver it right into your inner ear, where it is sent to the brain. 1  When a person speaks, the hearing aid microphone picks up the sound to convert it into electrical signals.