Misc: With a specific gravity of 22.57, what is the densest of all measurable elements?

Questions

In 1884 ---------- Gernsback, responsible for science fiction becoming an independent literary form, born. ?

In 1884 Hugo---------- , responsible for science fiction becoming an independent literary form, born. ?

In 1892 ---------- Foster, cartoonist, created "Prince Valiant", known for it's fine drawing and historical detail, born. ?

In 1892 Harold---------- , cartoonist, created "Prince Valiant", known for it's fine drawing and historical detail, born. ?

In 1892 Harold Foster, cartoonist, created "---------- ", known for it's fine drawing and historical detail, born. ?