He quickly says that he set the sphere’s origin to the world origin. This can be done in 2 ways. First, move the sphere to above the cube and then press ctrl+a->Location. Second, is to tab into edit, press A to select all, and move the sphere above the cube. There is also a third way. Move the sphere above the cube and then press Ctrl+period, and move origin back to the world origin. Press ctrl+period to exit out of origin transform mode.
