Did you ever wonder how color changing markers work or how Gak is made?  Find out on Thursday, Oct. 20 when Dr. Caryl Fish's general chemistry freshman seminar will be presenting the “Chemistry of Toys” from 1 to 3 p.m. in the Carey Student Center lounge.  The presentations will feature hands-on demonstrations in celebration of National Chemistry Week.  Everyone is invited to stop by for chemistry related give-aways and to learn a little about how chemistry affects you!