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.
Background. Nelson Mandela was born in Transkei, South Africa, on July 18, 1918. He is one of the most well-known anti-apartheid activists in South Africa. He was jailed in 1964 for leading the liberation movement against apartheid and for his stance on the human right to live in freedom.