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Show Attraction and Repulsion (lei a saucer ot water, u lump ol ugar. a small piece ot soap anil a number of hits of matches or looth picks', and you are ready tor an Interesting In-teresting experiment. l-'irM place some of the hits of wood lu Hie watei In the saucer so Ihey will float ; we will call Ihcin hoys Now drop the piece of soup in the water among the "boys" and see now Miej will ran away from It. Boys don't like soap, you understand. Now. lake a Tresh saucer of water and (hop some new uialclcbiis Into It and call them girls Next drop the f piece of scgai join (he watei and see j bow the girls will run to ll because It is sweet. Perhaps yu would i;( to Li,,,,,- why lhe Utile hits ol wood behave so differently dif-ferently In lhe Iwo casi's. Without going into deep scienlllic explanations, the long anil short of ll Is that Hie soa'p In dissolving causes an oily til 1 1 1 to spread over the surface ot lhe wa tor. and this 111 tii hi radlallng I rum I the centei carries Hie sticks with It. The sugai In dissolving acts In a dif-' dif-' ferenl way; tin- dissolved sugai being j heavlei Hum the water, scltles lo lhe I bottom, causing a slight current toward to-ward the center ol lhe saiu-ei from the edges and carrying the slicks with it. This action In ellhei case soon ceases. - I'alliMtidcr |