Parenthetical Titles: (sad song)?

Questions

[science and technology] what is the name of the instrument used for measuring humidity in the air?

[science and technology] what fruit is considered to be the most nutritious?

[science and technology] the deficiency of which vitamin causes scurvy?

[science and technology] how many coloured squares has a rubiks cube?

[science and technology] what type of creature is a sidewinder?