Aluminium is a good electrical conductor and is often used in electrical transmission lines. It is cheaper than copper and weight for weight is almost twice as good a conductor. When evaporated in a vacuum, aluminium forms a highly reflective coating for both light and heat.
Nelson Mandela had a large family and had 13 brothers and sisters.  Of all of his siblings, he had one full brother and one half  brother.
Prince's parents, John L. Nelson and Mattie Shaw, are both dead and Tyka is his only sibling. After Tyka, Prince's closest relatives are his three half-sisters and four half-brothers. His father John had three daughters and two sons from his marriage to Vivian Nelson - Lorna, Norrine, Sharon, Duane, and John.