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16. Can ships be 'lost' at the edge of the Earth?
Yes, at least in places where there are no mountains preventing this from occurring. The edge of the Earth is, in places a tremendous waterfall, and anything going over the edge will disappear into the aether. This can also happen to aircraft which fly off the edge.

17. If large amounts of water disappear off the edge, where does all the water come from?
This is an argument for the theory that the Earth has a toroidal orbit. In a toroidal orbit, all the water which disappears off the edges falls back to Earth as rain when the Earth revolves about its orbit. This also means that the inhabitants of ships and aircraft lost in space will, in some occasions, return to Earth.

18. Does this explain Fortean phenomena, such as frog-falls?
Perhaps. One is tempted to believe that the frogs, fish and other beings are somehow expelled into space off the edge of the Earth. However, this conflicts with the long-established Mad Fishmonger theory, which states that showers of fish are the work of a deranged fishmonger and his cohorts. (See The Schrodinger's Cat Trilogy by Robert Anton Wilson for more details.)