Early Discoveries by Gerry Bailey
Early Discoveries
—
Gerry Bailey

Early Discoveries

Crafty Inventions

Gerry Bailey

47 pages • first pub 2005 (editions)

informative medium-paced

Description

Progress has led to more exciting inventions in this title of the Crafty Inventions series. Find out why astronomers developed the astrolabe, learn how military signals led to the invention of the kite and how the abacus made arithmetic easy. Then...

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