Dr. DAVID BLACK (Marine Biologist, Scripps Institution of Oceanography): About 50 percent of the earth's surface is made up of these big, flat plains of mud we know so little about.

NPR: Down Deep, An Unexpected Fish Boom

The buildings, with a circular shape and a flat roof, were made of mud, sun-dried mudbricks and stone.

UNESCO: Choirokoitia

The takeaway from the evolution of the claim to Award is that you always need to be careful about reaching for the Moon because you could wind up flat on your face in the mud.

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