Levers

Lever Phenomena Cloning Stonehenge https://www.youtube.com/watch?time_continue=157&v=lRRDzFROMx0 https://www.youtube.com/watch?v=H-J_6Jct_X8

Why might you need to know about levers? https://www.youtube.com/watch?v=AcJQOWLxjFc https://www.youtube.com/watch?v=IfphmT0SfHg

Wally Wallington wheels and pulleys for stone building. https://www.youtube.com/watch?v=_mRrB33wvGk