- Ramsey County, Minnesota (Wikipedia)
Ramsey County is a county located in the U.S. state of Minnesota. As of the 2020 census, the population was 552,352, making it the second-most populous county in Minnesota. Its county seat and largest city is Saint Paul, the state capital and the twin city of Minneapolis. The county was founded in 1849 and is named for Alexander Ramsey, the first governor of the Minnesota Territory.
- Roseville is a city in Ramsey County, Minnesota, United States. It is one of two Twin Cities suburbs that are adjacent to both Saint Paul and Minneapolis (the other is Lauderdale). The land comprising Falcon Heights, Lauderdale, and southern Roseville was unincorporated until Roseville incorporated in 1948 and Falcon Heights and Lauderdale incorporated in 1949.
- Plutonium (Wikipedia)
Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous.