A Time To Travel: Newton& Gravity Nanknowledge

Summary: The twins, Nuke and Nuse, are curious if Newton found gravity by "apple-attacking" , so they use "Niri" , a time travel gadget, to go back to Newton's era. After coming across Newton, they encounter some interesting but difficult phenomenon. To solve it, they use their physics expertise to help Newton, and figure out the gravity between earth & moon together! Finally, they come back to their present time, and realize that they have changed a part of the history.