Northwestern University graduate student Stephanie Zaleski guides Conlin Audenerd, 8, of Evanston, and Jason Yuan, 10, of Buffalo Grove through an experiment during "Take Our Daughters and Sons to Work Day". | Brian O'Mahoney~for Sun-Times Media

Xavier Wilson, 11, of Skokie, and Peder Albertson, 10, of Wilmette create a colorful putty during a workshop on polymers Thursday at Northwestern University.| Brian O'Mahoney~for Sun-Times Media

Dalia Davidson, 9, of Evanston, and Peder Albertson, 10, of Wilmette make "Edible Slime" during a workshop on polymers Thursday as part of Northwestern University's "Take Our Daughters and Sons to Work Day." | Brian O'Mahoney~for Sun-Times Media

Paul Graham, 9, of Wilmette, and Dalia Davidson, 9, of Evanston make a non-edible play putty during a workshop on polymers at Northwestern University Thursday, part of "Take Our Daughters and Sons to Work Day." | Brian O'Mahoney~for Sun-Times Media

Jason Yuan's slimey creation started as Borax, school glue, water and food coloring during a workshop on polymers during Northwestern University's Take Our Daughters and Sons to Work Day. . | Brian O'Mahoney~for Sun-Times Media

Allison Lee of Wilmette makes some non-edible play putty during a workshop on polymers Thursday, part of Take Our Daughters and Sons to Work Day at Northwestern University. | Brian O'Mahoney~for Sun-Times Media

Nine-year-old Dalia Davidson of Evanston massages her slimey creation during a workshop on polymers Thursday during Northwestern University's "Take Our Daughters and Sons to Work Day." | Brian O'Mahoney~for Sun-Times Media