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by Rahul 14 May 2008, 02:29
Leonardo Da Vinci's 10 Best Ideas
Geologic Time

Plate tectonics? No sweat. While most of his contemporaries explained inland, mountain-top mollusk fossils as leftovers from the Great Flood, Da Vinci thought otherwise. He supposed (right) that the mountains must once have been coastline before many years of gradually shifting upwards.