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.
Just 20 years ago, most hearing aids were analog; they were not programmable and certainly not digital. Hearing aids had no software, they were adjusted using a screwdriver, and generally, there were only two adjustment screws. Most hearing aids didnt have telecoils, and very few had directional microphones.