Membranophones are one of the main divisions Musical Instruments. They further classified by many features. One such feature is shape and structure. Hour Glass Drums comes under this one. These ancient drums seen from early Times. called as Talking in West Africa. In drum pitch can be regulated according to tone prosody human speech. Most talking sound like a humming depending on way they playe...

nowadays mobile phone is very popular, causing concern about the effect it has on people's health. parotid salivary glands are in close contact to cell phone while talking with the phone and the possibility of being affected by them. limited studies have evaluated the effect of cell phone use on the secretions of these glands; so this study was designed to investigate the effects of duration of...