You are given a sentence in English. Your job is to translate the English sentence into Japanese.

The guys were up there for a month at a time.
そこで男たちが１ヶ月過ごすのです

A key notion in those equations is fitness.
これらの方程式で鍵となる概念は適応度です

And that's why helium's called helium.

そこからヘリウムの名がつきました

