Surely you have things in your mind on how things work, and could it be done differently. Ever consider your "beauty" creams, what is in them? or how they make skin soft? Or how yogurt is made? Or cottage cheese? or Cheese? What about butter...can it be made from store bought cream? Why? What about hair colorings? How do they work?
https://science.wonderhowto.com/how-to/best-investigatory-projects-science-16-fun-easy-ideas-kickstart-your-project-0147689/
What Science Investigatory Project ideas can you recommend for a tenth grader?
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