Michael Lopez, 17, left, talks Saturday to friend Alex Ragland about his project, “Hydrokinetic Energy System” during the St. Mary's County Science and Engineering Fair at Great Mills High School. Lopez won one of the grand awards in the senior division, along with Mina Fahmi for his project “iControl.” The junior grand awards went to Juliana Geyer for her project “Meteor Angle and Sediment Size vs. Material Displacement,” and Jaret Williams for his project “Smart Mailbox.”