Isaac Asimov

Traces the path of discovery that revealed the nature of the atom, of light, of gravity, of the electromagnetic force, and the nature and structure of the universe.

Introduces the third largest known planet in the solar system.

Briefly describes several kinds of ships and the forces that cause them to float or sink.

A description of Mars, the fourth planet from our sun, which includes information on the controversy over possible life on Mars, on the planet's moons, and on space probes and spacecraft which have studied it.

Describes the adventures of the seventeenth-century English explorer, from his search for a short route from Europe to the Orient to his mysterious disappearance after members of his crew mutinied.

Presents the story of the Portuguese explorer who became the first European to cross the Pacific Ocean and whose expedition completed its voyage around the world after his death en route.