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St. Paul, Minn.

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Kettle River
A notch in the rock wall shows where a 35-foot dam once blocked the flow of the Kettle River. The state Department of Natural Resources has identified about 100 dams in Minnesota that need to be torn down, repaired or modified.
MPR Photo/Stephanie Hemphill
Gallery
7 of 7
Luminary display
The Scott County Historical Society honored veterans with a luminary display in Stans Garden in Shakopee, Minn., on Veterans Day, Thursday, Nov. 11, 2010.
MPR Photo/Nikki Tundel
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Kettle River
A notch in the rock wall shows where a 35-foot dam once blocked the flow of the Kettle River. The state Department of Natural Resources has identified about 100 dams in Minnesota that need to be torn down, repaired or modified.
MPR Photo/Stephanie Hemphill
2 of 7
Didymo, aka rock snot
Jo A. Thompson holds samples of didymo, a one-celled organism, collected from rocks near the mouth of the Knife River along the shore of Lake Superior near Knife River, Minn. While Didymo isn't causing problems in Lake Superior yet, just why it's not a problem is a mystery that a handful of scientists are racing to solve.
MPR Photo/Derek Montgomery