Great way to learn physics
IT IS A VIRUS, DO NOT DOWNLOAD I kept getting the same restart messages as everyonemelse and it spams your screen even when you leave the app, it makes it so you are unable to do anything else and almost crashed my device. DO NOT DOWNLOAD!
Wow... Forced restart over and over... One of the worse apps I've installed in Android and requires forced restart that never ends.
Useful for busy students Gr8 app