2011 How Do We Know
How Do We Know: Tracking Tornadoes
How do we know when a tornado is forming? Scientist Harold Brooks explains how Doppler radars are used to track storm formation.
How Do We Know: Shrinking Arctic Sea Ice
Learn how NASA scientists are tracking the melting Arctic sea ice and what less ice means for global warming in the future.
How Do We Know: Hurricane Hunting
National Hurricane Center scientist Jack Beven explains the technology used to forecast and track potential hurricanes as they happen.
