Shielding a Magnetic Field

Zach entered the school science fair this year. The top students at his school got to go on to the disctrict science fair. He was one of the ones that made it! Here he is at the Disctrict Science Fair. The top 60 got to go on to State. Unfortunately he wasn't one of them. But there's always next year! Way to go Zach for making it as far as you did ! ! !