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 Mandela Biography. Born: 1918 Transkei, South Africa. South African president and political activist. Nelson Mandela is a South African leader who spent years in prison for opposing apartheid, the policy by which the races were separated and whites were given power over blacks in South Africa.