If you want to determine whether 80-year-old maggie's brain is active while she is reading you should use

You should use magnetic resonance imaging. La resonancia magnetica es un tecnica no invasiva (no requiere cirugia) que utiliza resonancia magnética nuclear para obtener imagenes de la estructura interna del cuerpo. Es usada tradicionalmente para observar los procesos neurologicos de un paciente, pues la persona está consciente durante el examen neurologico. I hope my answer can help you.

A- slaverythe civil war was fought to prevent the expansion of slavery, not the abolotion of it