A science fair project idea (for hs) that would actually be beneficial
Take your pick.
https://www.google.com/search?source=hp&ei=spGFXMm0HoLasQX_oI7IAw&q=science+fair+projects&oq=science+fair+&gs_l=psy-ab.1.0.0l10.2980.5803..10523...0.0..0.199.1400.7j6......0....1..gws-wiz.....0..0i131.AprjRccPQ2Q