Mel science kits. There are 44 and all include supplies to do each experiment at least once (you would need to buy Lemons, marshmallows, household things). We home school and were doing the monthly $35 kits. Over $700 worth of science if you bought their kits. There is an app with the experiments you can download and look at. Asking $200 obo. Moving soon, need gone by May 19th.