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.
Normally, there are different cases for the Deaf who want to become hearing (as in their attitude) as they desire by wearing assistive technology devices such as hearing aids, cochlear implants, etc. are not classified as a mental disorder case that the society perceives this as a normal case.