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.
Prince William, Duke of Cambridge meets Zindzi Mandela (right), daughter of former South African president Nelson Mandela. Shocked: Prince William pays tribute to Nelson Mandela after learning he had died shortly before the London premiere of a new film documenting his life.