TUESDAY NEWSDAY: * Making Mars a one-way trip? * Hearts and minds: fighting the war inside the Beltway . * Hey, remember back in 2008, when McCain was praising Ireland's low taxes on businesses, and using it as an example of what we should do over here? Funny story. * A memorial becomes a rallying point for gay veterans . * The new media game: what next for the Tea Party ? * Checking in on four psychology fads . * Whoah. Checking out the sunset on another planet . * "The World Comes to Mecca : Images from the largest annual pilgrimage on earth." * Daniel Radcliffe sings the elements .