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 Family While Nelson Mandela led a nation against apartheid and served as one of the worlds leading heroes, we have to ask who were the family who stood with him and suffered with him Former South African President's Journey to Civil Rights Leader