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1) Gravity
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Series
Summary
Discusses early theories on gravity, principles of how gravity works, and possible effects of gravity with regards to such phenomena as white dwarfs and black holes.
4) Electricity
Author
Series
Summary
Explains some examples of electricity in nature, early experiments with electricity, the development of use of electric power, and possibilities for the future.
5) Space travel
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Series
Summary
Examines the history of people's interest in space travel, the development of efforts to leave Earth, and possibilities for colonization and exploration of outer space.
6) Cloning
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Summary
Discusses the history of cloning, its possible applications, and some of the controversy surrounding it.
