They wanted to see what role two further subareas of the ventral hippocampus — called the CA1 and CA3 — play in terms of approach - avoidance conflict processing. (sciencedaily.com)
Borck and his collaborators studied the relationships of 22 different subareas in the Southwest, based on an analysis of 800,000 painted ceramics from more than 700 archeological sites. (sciencedaily.com)
It looks like the axe bridge is the game's way of ending any Castle level rather than a placeable object, but you can set up warp pipes to take you to different subareas (grass, ghost, airship, etc.). (reddit.com)