something extraordinary on mars. the thing they found us very cold, very salty, and raises the potential that alien life exists there. is it a large rock in the shape of a man, a vast underwater lake, or an ancient package of peanuts? >> b. >> tucker: is it a vast underwater lake, i was rooting for peanuts. >> scientists say they discovered liquid water on mars. >> it was discovered in the martian south pole. >> it's 1 mile beneath the frigid service. there areac hopes that where the is water there could be life. >> tucker: it is the lake, katie pat which takes the lead. question two. prepare yourself. there is a man running for mayor in the city of chicago, his name is willie wilson. he is under a lot of scrutiny