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. A Hearing aid is as the name implies an aid to hearing. It assists peoples hearing by increasing the loudness of a signal (speech, music) from a level below or at the minimum auditory threshold to a comfortable listening level. This comfortable listening level is often called the MCL (Most Comfortable Level).