When the alloy cools and solidifies (crystallizes), its mechanical properties will often be quite different from those of its individual constituents. A metal that is normally very soft and malleable, such as aluminium, can be altered by alloying it with another soft metal, like copper. Although both metals are very soft and ductile, the resulting aluminium alloy will be much harder and stronger. Adding a small amount of non-metallic carbon to iron produces an alloy called steel. Due to its very-high strength and toughness (which is much higher than pure iron), and its ability to be greatly altered by heat treatment, steel is one of the most common alloys in modern use. By adding chromium to steel, its resistance to corrosion can be enhanced, creating stainless steel, while adding silicon will alter its electrical characteristics, producing silicon steel.
What kind of metal is soft like copper?
aluminium

Feynman attended Far Rockaway High School, a school in Far Rockaway, Queens also attended by fellow Nobel laureates Burton Richter and Baruch Samuel Blumberg. Upon starting high school, Feynman was quickly promoted into a higher math class. An unspecified school-administered IQ test estimated his IQ at 123high, but "merely respectable" according to biographer James Gleick. When he turned 15, he taught himself trigonometry, advanced algebra, infinite series, analytic geometry, and both differential and integral calculus. In high school he was developing the mathematical intuition behind his Taylor series of mathematical operators. Before entering college, he was experimenting with and deriving mathematical topics such as the half-derivative using his own notation.
Feyman taught himself many math subjects, including Trigonometry at what age?
15

Rugby league is mostly played by Samoans living in New Zealand and Australia,[citation needed] with Samoa reaching the quarter finals of the 2013 Rugby League World Cup made of players playing in the NRL, Super League and domestic players. Many Samoans and New Zealanders or Australians of Samoan descent play in the Super League and National Leagues in Britain. Francis Meli, Ta'ane Lavulavu of Workington Town, Maurie Fa'asavalu of St Helens and David Fatialofa of Whitehaven and Setima Sa who signed with London Irish rugby club. Other noteworthy players from NZ and Australia have represented the Samoan National team. The 2011 domestic Samoan rugby league competition contained 10 teams with plans to expand to 12 in 2012.
In what competition did the Samoan rugby team reach the quarter finals in 2013?
Rugby League World Cup