Science and U: Dr. Yu Solves Magnetic Mystery on Moon

Physicist Dr. Weiping Yu returns with a brand new segment of Science and U to comment on whether magnetism can reduce pollution in waters, how to make tiny metal snowflakes, strange magnetic anomaly on the moon, how we can move objects with ultrasound, and more. How do we make sense of the symmetrical shapes of snowflakes? Is it correct to assume that the moon doesn’t have a magnetic field?