Don't believe the hype! The's a big difference between an ice sheet and sea ice. And the movement can actually move the axis of the Earth herself! To explain which is which, Dr. Surendra Adhikari from JPL/Caltech tells Kevin, Jimmy, and Owen the difference. Using a NASA satellite, Dr. Adhikari, tells how he made his measurements that grabbed social media's attention last week. Since Jimmy's back from Boston after hanging with real life heroes, he tell the guys about the trip.