How did Marian Bechtel come up with idea for a mine
detector?

Inspired by the way notes played on a piano vibrated strings on a nearby banjo, in 2011 Pennsylvania teen Marian Bechtel invented a landmine detector that uses sound waves.

Explanation:

Marian Bechtel is a 17-year-old girl whose passion for music and science led her to invent a device that uses sound to detect explosive land mines.

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !

its a hard situation i cant really answer because the essay is for you to write.