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.
How many kids does Nelson Mandela have? Nelson Mandela has fathered six children with three wives, and the beloved former South African president and anti-apartheid leader has 17 grandchildren and 14 great-grandchildren, according to NelsonMandela.org. RELATED: Nelson Mandela Rushed To Hospital, In âSerious Conditionâ.