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 Rolihlahla Mandela was born in Transkei, South Africa on July 18, 1918. His father was Hendry Mphakanyiswa of the Tembu Tribe. Mandela himself was educated at University College of Fort Hare and the University of Witwatersrand where he studied law.