East Lyme Middle School science teacher Samantha Cregger, right, observes Friday as four of her fifth-graders, from left, Daven Roberts, 10, Grace Foltz, 11, Saige Deveau, 10, and Sydney Taylor, 10, test the viscosity of a milk/yogurt mixture that has been culturing for 11 days. The students are among several teams at the school competing to have their science experiment sent to the International Space Station. Creggers' students hope to learn whether the L.Acidophilus bacteria in the yogurt continues to grow in microgravity.