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 donated all his prize money to a variety of children's charities, as he recognised that they were the most vulnerable and most in need of assistance. South Africa's first democratic elections took place in April 1994 and Nelson Mandela was inaugurated as President of South Africa on May 10th 1994.