Perhaps Thor H was right sometimes. When he asked the natives on Easter Island where they came from they all said "from the east".

When the Nat Geo Prog finally gets broadcast there's a small piece on Neolithic boatbuilding included, as a one-time apprentice boatbuilder, I am of the opinion that pre-historic man was probably sailing the seas long before the last ice age, the reproduction of the "North Ferriby Boat" screams out to me "sea going boat".