Isaiah just finished reading a biography about Thomas Edison. I think I learned more than he did. We made our own "phonograph" from a rolled up piece of card stock, then you attach a toothpick to the end with tape. Take a piece of tin foil and crumble it up. Then listen in the cone as you slide the tin foil. It's pretty neat...vibrations create sound!
Some lessons on pulleys via Supercharged Science. LOVE THIS WEBSITE!