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Thomas Edison is remembered for inventing the
phonograph and electric light bulb, but he held more than
one thousand patents for devices likel an improved
stock ticker, alkaline storage batteries and an early video
camera.

The reversalists continue their labors, confident that they will one day construct an engine that generates more compression than it uses, a perpetual power source that will restore to the universe its lost vigor. which theme is best supported by the excerpt? a. scientific study requires dedication and perseverance. b. people will always look for a way to achieve immortality. c. death must always be endured alone. d. change is difficult to accept but beneficial if embraced.