Speaker are designed to convert electric signals into sound we can hear. Have a go at making your own speaker to find out how simple it really is. I want to make a working mock up to demonstrate the principle. Thomas Newcomen invented the first successful steam engine, make your own at home from a tyre pump. Mess about with boats and discover the principles behind steam power.
Chickens prefer a quick get away to doing needle work.
Try making Erasmus Darwin's speaking machine. Number 3 Fool your friends into thinking you have new-found artistic talent with this nifty drawing device Adam's Favourites. Follow in the footsteps of one of science's greatest thinkers by making Galileo's Pendulum. Have a go at giving lemons a fizz with my Lemon Acid Test experiment. Try modelling osmosis in the kitchen and changing the concentration of water.