In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Voice of the king in bedknobs and broomsticks?
Leonard Weinrib

Who invented the first curling iron in 1872?
Francois Marcel Grateau

A cube with a side length of blank unit is called a unit cube?

1 unit