- Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali metal in the group to have a density higher than water. On Earth, natural rubidium comprises two isotopes: 72% is a stable isotope 85Rb, and 28% is slightly radioactive 87Rb, with a half-life of 48.8 billion years – more than three times as long as the estimated age of the universe.
- Minnesota State Fair (Wikipedia)
The Minnesota State Fair is the state fair of the U.S. state of Minnesota. Also known by its slogan, “The Great Minnesota Get-Together”, it is the largest state fair in the United States by average daily attendance and the second-largest state fair in the United States by total attendance, trailing only the State Fair of Texas, which generally runs twice as long as the Minnesota State Fair.