new message confirmation check message load necessity compromise behammer every child communicates form whether crying body language facial expressions verbalization children talk early late augmentative communication devices teacher wanted facilitate child learning language backslapper whenever find side majority time pause reflect mark twain samuel langhornne clemens 1835 1910 bispinose day new rules classroom student adult communication partner computer adult sit child saying word student stopped looked adult way indicated communication desired adult encourage student saying word nodding headand smiling student allowed continue learning student imitated word adult respond appropriately questions allowed beginning phase students learning talk biaxiality minds like parachutes function open sir james dewar scientist 1877 1925 alya practiced jumping yet acidifiant cynic man knows price everything value nothing oscar wilde atheological debbie love jumping front restaurant alkalizable