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Author
Series
Accelerated Reader
IL: MG - BL: 5.8 - AR Pts: 1
Language
English
Description
"People have been experimenting with drones for more than 150 years. During the U.S. Civil War, they tested hot-air balloons loaded with explosives on timing devices. These early drones were dangerously unreliable and uncontrollable. Spies in hot-air balloons proved the importance of aerial surveillance but also the risk. Technology soon caught up and made flying and spying using unmanned aircraft possible. Today, drones do more than ever before....
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