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's father, Gadla Henry Mphakanyiswa Mandela, was a local chief and councillor to the monarch; he was appointed to the position in 1915, after his predecessor was accused of corruption by a governing white magistrate.