Measures 1 inch. New enamel pin from Take A Penny Co! The "Science Heroes Edition" celebrates the heroes of human achievement! Thank Darwin for these legends of cerebral contributions to human kind. If you grew up in the 90's you are familiar with everyone's favorite kid friendly science guy, Bill Nye! What a wonderful way of inspiring the next generation. Pin this fellow to your lapel, bag, hat or any other item that needs sprucing.