Butler sixth-grader Kaylee Haff grimaces as she tries to cut a cow's eye in half. Bill Bosworth of Science Alliance instructed students on how to dissect a cow's eye. | Jon Langham—for Sun-Times Media

Butler Junior High sixth-graders learned the fat and connective tissue had to be removed before the cow's eye could be properly dissected during a Dec. 11 workshop. | Jon Langham—for Sun-Times Media

Butler Junior High sixth-grader Mia Hall points out the vitreous humor as her lab partner Sarah Berg makes an incision on a cow's eye during a Dec. 11 workshop. | Jon Langham—for Sun-Times Media

Butler Junior High sixth-grader Cayden Griffith reaches out to touch the vitreous humor that lab partner Joe Poskin squeezes out from their dissected cow's eye during a Dec. 11 workshop. | Jon Langham—for Sun-Times Media

Butler Junior High sixth-graders gather around Bill Bosworth as he hands out cow's eyes for them to dissect during a Dec. 11 workshop. | Jon Langham—for Sun-Times Media

Workshop instructor Bill Bosworth gives a brief lecture on the digestive system before handing out the main attraction, cow's eyes for dissection, Dec. 11 at Butler Junior HIgh School. | Jon Langham—for Sun-Times Media