All content that appears in the main body of a page can be moved around (the main body is the area between the navigation menu at the top and the footer at the bottom).
"Did you know..." content in right sidebar
The "Did you know..." being moved to the new location (indicated by yellow)
The "Did you know..." content in it's new location. Notice that in the left sidebar, the "On this day..." content automatically moved up to the top of the sidebar.