Brainstorm! 在線電子書 圖書標籤:
發表於2024-11-13
Brainstorm! 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024
"Inspiring young inventors, from ages 5 to 19" Of the thousands of inventions filed each year since 1790 with the United States Patent Office, some have come from neterprising kids, and not just those who have grown up to be famous adult inventors. Here are the stories of twenty ingenious young Americans. Among them are Chester Greenwood, creator of ear muffs; Ralph Samuelson, originator of water-skiing; Vanessa Hess and her colored car wax; and Jerrald Spencer, whose electronic gizmo has made a line of toys so popular that over five million of them have been sold
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Brainstorm! 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024