"STEM Islands. Movement and Sound" now available on AppStore

“STEM Islands. Movement and Sound” includes 6 topics:

•Mechanical phenomena, movement.
•Kind of motion.
•Distance, Time, Speed.
•Relative motion.
•Sound.
•Propagation of sound.

https://itunes.apple.com/us/app/stem-islands.-movement-sound/id913127073?ls=1&mt=8