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Alloys are often made to alter the mechanical properties of the base metal, to induce hardness, toughness, ductility, or other desired properties. Most metals and alloys can be work hardened by creating defects in their crystal structure. These defects are created during plastic deformation, such as hammering or bending, and are permanent unless the metal is recrystallized. However, some alloys can also have their properties altered by heat treatment. Nearly all metals can be softened by annealing, which recrystallizes the alloy and repairs the defects, but not as many can be hardened by controlled heating and cooling. Many alloys of aluminium, copper, magnesium, titanium, and nickel can be strengthened to some degree by some method of heat treatment, but few respond to this to the same degree that steel does.

What kind of treatment can be made to alter it's properties?
Answer: heat treatment
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The FIBA Africa Championship 1981 was hosted by Somalia from 1523 December 1981. The games were played in Mogadishu, and the Somali national team received the bronze prize. Abdi Bile won the 1500 m event at the World Championships in 1987, running the fastest final 800 m of any 1,500 meter race in history. He was a two-time Olympian (1984 and 1996) and dominated the event in the late 1980s. Hussein Ahmed Salah, a Somalia-born former long-distance runner from Djibouti, won a bronze medal in the marathon at the 1988 Summer Olympics. He also won silver medals in this event at the 1987 and 1991 World Championships, as well as the 1985 IAAF World Marathon Cup. Mo Farah is a double Olympic gold medal winner and world champion, and holds the European track record for 10,000 metres, the British road record for 10,000 metres, the British indoor record in the 3000 metres, the British track record for 5000 metres and the European indoor record for 5000 metres. Mohammed Ahmed (athlete) is a Canadian long-distance runner who represented Canada in the 10,000 meter races at the 2012 Summer Olympics and the 2013 World Championships in Athletics.

For what nation did Hussein Ahmed Salah compete?
Answer: Djibouti
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Vehicles typically include headlamps and tail lights. Headlamps are white or selective yellow lights placed in the front of the vehicle, designed to illuminate the upcoming road and to make the vehicle more visible. Many manufactures are turning to LED headlights as an energy-efficient alternative to traditional headlamps. Tail and brake lights are red and emit light to the rear so as to reveal the vehicle's direction of travel to following drivers. White rear-facing reversing lamps indicate that the vehicle's transmission has been placed in the reverse gear, warning anyone behind the vehicle that it is moving backwards, or about to do so. Flashing turn signals on the front, side, and rear of the vehicle indicate an intended change of position or direction. In the late 1950s, some automakers began to use electroluminescent technology to backlight their cars' speedometers and other gauges or to draw attention to logos or other decorative elements.

What color are headlamps on a vehicle?
Answer:
white or selective yellow