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Hayden Rice, 8, left, Ryle Balatico, 11, Tirzah Navarrese, 13, and Tabitha Myers, 14, showed off their projects Wednesday in preparation for today’s ninth annual Girl Scouts of Hawaii STEM Fest. Hayden and Ryle created aquaponics using Mason jars. Tirzah and Tabitha used air pressure to launch their model rockets.