The 'Little Ice Age' in Scandinavia saw big glaciers growing from 1300 to 1750, then shrinking rapidly from the early 1900s. Austerdalsisen glacier in Norway split into two branches during this time, with the western one advancing over 4 km and the southeast one over 3 km. Now, most meltwater flows southeast, but if the glacier gets too big, it could start flowing west. By studying lake sediments and historical records, researchers figured out how the glacier shrank after the 'Little Ice Age'. They used an unusual method to reconstruct the glacier's history by looking at how much sediment ended up in a lake when the glacier changed its meltwater flow. When the glacier was close to its biggest size, floods happened towards the southeast.