Top reasons for learning Sign Language SL is a 3-dimensional language. SL is beautiful, unique and graceful. Being a bilingual, trilingual or more, it improves your languages. You can sign with your mouth full.
Scuba divers can communicate underwater.
Firefighters can talk in the dark and smoke. You can talk through windows of buildings in the long or short distance. Drivers can talk briefly in any lanes while driving. You can be sure that nobody can overhear through doors. You can talk and talk as much as you like in a library or church.