TY  - BOOK
AU  - Rau, Dana Meachen.
TI  - Simple machines
SN  - 9780531265864
U1  - SC R19 2012 
PY  - 2012///
CY  - New York
PB  - Scholastic
N1  - 780L
N2  - How did workers in ancient civilizations move the huge stones they used to build cities? They rolled the stones over logs much like a modern-day conveyor belt.

Inside, you'll find:
-How humans have used simple machines throughout history;
-A timeline, photos- and how simple machines can be combined to do different jobs;
-Surprising TRUE facts that will shock and amaze you!
ER  -