Marietta Middle School teacher Martin Esterman recently won the "National STEM Video Game Challenge." The competition challenged educators to come up with creative ways to motivate students' interest in science, technology, engineering and math (STEM). Esterman, a seventh and eighth grade math teacher, created a video game that requires players to use arithmetic skills to win. For winning the contest, Esterman will receive $10,000 to further develop his idea with guidance from other experts.