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.
By Dennis Van Vliet, Au.D. on Oct 1, 2013. In its simplest form, a hearing aid is an amplifier that makes sound louder. Todayâs hearing aids do much more than that, but they wouldnât help much if they didnât amplify. So letâs ignore all of the fancy technical stuff for now and look at a basic electronic amplifier.