These are hearing aids. They take the sounds of the world and amplify them." Josh Swiller recited this speech to himself on the day he arrived in mununga, a dusty village on the shores of lake mweru. Deaf sin these are h...These are hearing aids. They take the sounds of the world and amplify them." Josh Swiller recited this speech to himself on the day he arrived in mununga, a dusty village on the shores of lake mweru. Deaf sin these are hearing aids.