World's best AWD system! The Role of All -Wheel Control (AWC) Performance, reliability and safety are three attributes that are core to the Mitsubishi Motors brand, and AWC plays a key role in all three of these attributes. Safety technologies and systems can broadly be broken into Passive Safety and Active Safety.
Pennies were made mostly of copper until  mid-1982, when the composition was changed â¦to 97.5% zinc with a  plating of 2.5% copper.    The only exception was in 1943 when wartime copper shortages forced  the Mint to make pennies out of scrap steel. Bronze cents were  resumed the next year, 1944.
Pennies get dull and dirty because the copper in the pennies reacts with oxygen in the air to form copper oxide. When you put your pennies in a vinegar and salt mix, the vinegar and salt react together and remove the copper oxide.ennies get dull and dirty because the copper in the pennies reacts with oxygen in the air to form copper oxide. When you put your pennies in a vinegar and salt mix, the vinegar and salt react together and remove the copper oxide.