Summary: Mr. Trash Wheel is a wheel that collects trash using the current of the Jones Falls river and solar power. The wheel keeps trash out of the Baltimore Harbor. It puts the trash into a dumpster barge.
Vocabulary: A word needed to understand the article is solar power. The noun means power obtained by the energy of the sun's rays. Another word needed to understand the article is current. The adjective is a body of water moving in a definite direction, especially through a surrounding body of water in where there is less movement.