- 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.
- Demna (designer) (Wikipedia)
Demna Gvasalia (Georgian: დემნა გვასალია dem-NAH gvah-SAH-lee-AH; born 25 March 1981), known mononymously as Demna (/dɛmnʌ/ dem-NAH) is a Georgian fashion designer, currently the creative director of Balenciaga and the co-founder of Vetements.