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.
Nelson was a talented jazz musician in Minneapolis. His performances mesmerized Prince, who would go to his father's shows at a young age. Pictured above is Nelson with Prince's mother, Mattie Shaw (second left), sister Tyka Nelson (right) and half-brother, John Lewis Nelson (right)