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.
Thursday, 18 July 1918. Nelson Rolihlahla Mandela was born on 18 July 1918 in the small village of Mvezo, in the district of Qunu near Umtata, Transkei (now known as Eastern Cape). Mandela became involved in politics while a student at Fort Hare University after he met Oliver Tambo, who became his life-long friend.