use arrow keys like powerpoint
credit to https://www.fesliyanstudios.com/royalty-free-music/downloads-c/presentations-music/55 for music Bibliography: https://www.nature.com/scitable/knowledge/library/the-conservation-of-mass-17395478/#:~:text=The%20Law%20of%20Conservation%20of%20Mass%20dates%20from%20Antoine%20Lavoisier%27s,the%20end%20of%20the%20reaction.
