wounderfull website i just passed by it simplify science and provide projects for better understanding
http://www.sciencemadesimple.com/

Charles Coulomb first described electric field strengths in the 1780's

fluorescent light bulb (not an incandescent bulb)

Why Do Leaves Change Color in the Fall?

http://artsites.ucsc.edu/EMS/music/tech_background/te-20/teces_20.html Microphone theory