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The Concept Map you are trying to access has information related to:
death in the morning 2, touch stone discovered Mediterranean, voyages of discovery needed compass, Ptolemy lived in Alexandria, vaccum pump experiments led to Hot air balloons, touch stone discovered over 2000 years ago, Cloud Chambers led to radar, increased commerce built Alexandria, atmospheric changes research produced Cloud Chambers, discovery of electricity by Ben Franklin, Hot air balloons allowed Weather cataloging