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.
Youth and education. Nelson Rolihlahla Mandela was born in a small village in the southeastern region of South Africa called the Transkei. His father was chief of the village and a member of the royal family of the Thembu tribe, which spoke the Xhosa language.