Almost anywhere he looks, Princeton professor Craig Arnold sees energy.
"Plants convert light to sugar -- this is chemical energy," Arnold told students in his freshman seminar on "Science and Technology for a Sustainable Future." "Cars take chemical energy and convert it to linear motion. We convert electrical energy into visible light by using a light bulb."
For Arnold, an associate professor of mechanical and aerospace engineering and an associated faculty member of the Princeton Environmental Institute, the intricacies of energy are central to his research.
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