Subject: When was the lever invented?
Date: Thu Feb 10 20:42:09 2000
Posted by John
Grade level: K-3
School: osburn
City: silverton State/Province: ID
Country: U.S.A
Area of science: Science History
ID: 950236929.Sh
Message:
I might need to know because my class is learning about simple macchines.
Re: When was the lever invented?
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