these hearing aids did not make sound louder but collected sound and directed it into the ear which made the sound energy stronger when it hits the ear drum, helping to make hearing easier for people with hearing loss. kay was known for his work as "to dance with the white dog". the spiral arms are where new hot stars are born. they are famous because in many parts of the roads, there are no speed limits and drivers can drive as fast as they want to. mars has two permanent polar ice caps. 