Venus, the second planet from the Sun, is perpetually veiled behind\nopaque clouds of sulfuric acid droplets atop a hot, heavy, carbon\ndioxide atmosphere. In size and apparent composition, however, it is a\nnear twin-sister of the Earth. Why is it do different? In this lecture\nI review the basic properties of Venus, and examine the similarties and\ndifferences with the Earth. Recorded 2007 Nov 8 in 1000 McPherson Lab on\nthe Columbus campus of The Ohio State University.