off of. they ve done studies, how bad a heavy backpack is for the back. what is happening now the kids can actually purchase and rent their textbooks on the kindle, the page numbers will match. every year, kids have classics, that they have to read for school summer reading and regular reading. you can download hundreds of them that are free. great for adults. affordable. lightening. and good for the back. love it. i will move a few things. we ll talk circuits. so this is snap-it circuit board. it s really about learning to make a circuit board and programming a computer. don t shock yourself. so, there s about 40 different programs you can get. you turn this on. push a button. see what happens. and they re programmed for you. learn to put it together program it. also to see what happens afterwards. electronics lesson. future electricians. can t forget science. this stuff looks very interesting. dr. dreadful.