(Duluth, MN)  --  A retired Duluth couple is now in their 97th day of walking around Lake Superior.  Mike Link and Kate Crowley are researching the lake and have traveled more than 900-miles so far.  Back when the two started in late April, Link said it was once-in-a-lifetime journey.  Link and Crowley passed through the village of Wawa, Ontario to start the week.  They hope to be back in Duluth before the end of September.