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Published on Jan 15, 2013
Since you can't fit the earth in your lab, sometimes you have to build an earth that will fit in your lab. University of Maryland's Dan Lathrop leads the Three Meter Geodynamo experiment, which explores how the earth generates its magnetic field. 11.5 tons of liquid metallic sodium fills this model of earth's core - featured in this segment of Discovery Channel's Daily Planet (aired 12/3/12).