人类文明，因无数个科学家而汇集；人类历史，因无数个发明创造而改变。也许很多伟大的发明都源于不经意的小点子，可每一项发明的面市，都需要无数次的改进，这些都离不开科学家天才的灵感、艰苦的探索和辛勤的劳动。青少年朋友们更应该养成积极开动脑筋，勤于动手的习惯，用发明改写世界，用创新和智慧推动人类文明前进的脚步。
Availability can change throughout the month based on the library's budget. You can still place a hold on the title, and your hold will be automatically filled as soon as the title is available again.
The OverDrive Read format of this ebook has professional narration that plays while you read in your browser. Learn more here.
Your session has expired. Please sign in again so you can continue to borrow titles and access your Loans, Wish list, and Holds pages.
If you're still having trouble, follow these steps to sign in.
Add a library card to your account to borrow titles, place holds, and add titles to your wish list.
Have a card? Add it now to start borrowing from the collection.
The library card you previously added can't be used to complete this action. Please add your card again, or add a different card. If you receive an error message, please contact your library for help.