Weather Forecast


Radinovich wins DFL primary for 8th Congressional District

Science aboard the Blue Heron research vessel

The University of Minnesota Duluth’s Large Lakes Observatory will host a “Science on Deck” event today aboard its Blue Heron research vessel in Duluth.

The free event is from noon to 4 p.m. on the harborfront near the Great Lakes Aquarium, 353 Harbor Drive. The Blue Heron will be open for tours.

Sergei Katsev, an associate professor at the Large Lakes Observatory and the UMD Department of Physics and Astronomy, will give a talk at 3:15 p.m. titled, “The Iron Underpants of Lake Superior: How bottom sediments regulate the nutrient supply.”

“This presentation will delve deep below the surface to explore the unique features of the Lake Superior bottom,” event organizers reported. “In particular, it will show how tiny microbes living below the mud surface can create dense layers of iron underlying most of the lake, and how these layers restrict the productivity of the lake above them.”

We welcome your submissions and suggestions. Drop us a line at, or mail items to Eh?, Duluth News Tribune newsroom, 424 W. First St., Duluth, MN 55802.