The essential "previously" is, of course, the historical map of the Mississippi River's many courses. Previously: • Map of local embroidery techniques in Pakistan • Map of public toilets in ...

It will take days for major floodwaters to work their way south through the Mississippi. Flooding will persist through April.

Old Man River, indeed. Still, 70 million years ago the Mississippi was nowhere near as large as it would become. Blum has detailed how the waterway grew as it added tributaries: the Platte ...