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Joe Sheppard (from left), 8, and his brother Sam, 10, both of Orono, Avi Gersh, 8, of Bath and Teagan Blackie, 5, of Old Town play with light and currents emanating from plasma globes during the Engineering Expo at the Univeristy of Maine at Orono on Saturday. (BANGOR DAILY NEWS PHOTO BY BRIDGET BROWN)

CAPTION

Joe Sheppard, 8, (left) his brother Sam Sheppard, 10, both of Orono, Avi Gersh, 8, (center) of Bath and Teagan Blackie, 5, (right) of Old Town play with light and currents emanating from plasma globes during the Engineering Expo at the University of Maine in Orono on Saturday, March 1, 2008. (Bangor Daily News/Bridget Brown)