Magnets, old screws and silverware. Kids got to play and design with old bits of metal, learn how metal is recycled and the properties of various metals at the Homewood Science Center’s “Metal Mania” Pop-Up Science Program on Saturday, June 9. Professor John Sowa of Governors State University dressed in top hat and lab coat to present himself as a science magician who worked with magnets. Young and old were fascinated by his presentation. He had volunteers checking out the magnetic pull of small disks and then dropping them in tubes to see how . . .