UW-Madison and Canadian scientists applied stable (non-radioactive) mercury isotopes in Lake 658 by slowly dripping a dilution into the propeller wash of a small boat. The process began at dusk because bright sunlight can cause the isotopes to vaporize.
New research shows how quickly and dramatically plants in Wisconsin came under stress this year.
According to the US Department of Agriculture, the drought that has afflicted much of the United States this year has been the most severe in at least 25 years. But the federal agency wants to do more than simply report the bad news.