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 born September 29, 1942, in Miami, Florida, the only child of Nannie Merle (nÃ©e Nelson) and Clarence William Nelson. His ancestry includes Scottish, Irish, English, and Danish. His father died of a heart attack when Nelson was 14 and his mother of Lou Gehrig's disease (ALS) when he was 24.