Jennifer Boehme grew up scouting beaches around her home in St. Petersburg, Fla., for whatever she could find. Rocks, sand dollars, coquina mollusks — anything the ocean gave up.
The organization has been pushing since 2018 to create high-resolution maps of all five Great Lakes bottoms, but that's a daunting task. The lakes cover 94,250 square miles (244,106 square kilometers) ...