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.
His mother was Nonqaphi Nosekeni and his father was Nkosi Mphakanyiswa Gadla Mandela, principal counsellor to the Acting King of the Thembu people, Jongintaba Dalindyebo. In 1930, when he was 12 years old, his father died and the young Rolihlahla became a ward of Jongintaba at the Great Place in Mqhekezweni 1 .