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Autonomous and human driven. Human driven while terrain is difficult to maneuver Fuel cells are essentially batteries that don't need charging Shorter, lower center of gravity. Weights to balance Speed depends on terrain Circular transforming wheels can change in seconds Improved titanium alloy, withstands 300-350 Degrees Fahrenheit TEST-RAD tufted electrostatic fibers of polymer Scooper arm. Little amounts, deposits into top slowly