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Book, 1994
Current format, Book, 1994, , No Longer Available.
Book, 1994
Current format, Book, 1994, , No Longer Available. Offered in 0 more formats
Levers are frequently found in nature. The body's ability to move, for example, is entirely dependent on a complex system of levers. Early humans discovered that levers tremendously magnify applied force. Children who haven't yet observed this process are fascinated by it. Numerous lever-based toys provide hours of additional exploration.
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