And I set about to answer this question because even though many four-year-olds over all of time have probably asked this question, many experts, including myself, didn't know the answer.
Y me dispongo a responder a esta pregunta. porque a pesar de que muchos niños  de cuatro años en todo el tiempo probablemente han hecho esta pregunta, muchos expertos, incluida yo misma,  no sabíamos la respuesta.