It's always a good idea to have positive and negative controls. In both types of control, you know what the correct results of the experiment should be. If you don't get the correct answers, then you know something went wrong with your experiment.<br />. <br />.
Leigh Nash. Leigh Bingham Nash (/liË nÃ¦Ê/; born June 27, 1976) is an American singer and songwriter who is the lead vocalist for the pop band Sixpence None the Richer and is also a member of Fauxliage and Movement Nashville. Her debut solo album, Blue on Blue, was released on August 15, 2006 by One Son/ Nettwerk record labels.
Cyrus (born August 25, 1961) is an American singer, songwriter and actor. Having released 12 studio albums and 44 singles since 1992, he is best known for his number one single  Achy Breaky Heart , which became the first single ever to achieve triple Platinum status in Australia. It was also the best-selling single in the same country in 1992 and was translated into more than 100 languages.