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.
Bret Michaels. Bret Michael Sychak (born March 15, 1963), professionally known as Bret Michaels, is an American singer-songwriter and musician. He gained fame as the lead singer of the glam metal band Poison who have sold over 50 million records worldwide and 15 million records in the United States alone.