After Leonard Nimoy’s passing last week, several billboards went up in Atlanta to commemorate his most famous character, Dr. Spock of Star Trek.  The Atlanta billboard shows the infamous Spock making his signature Vulcan gesture, urging us to “Live Long and Prosper.”   Images of the billboards were tweeted and retweeted over 11,000 times, even Nimoy’s Star Trek co-star William Shatner retweeted a picture as the public wondered who was behind the tribute.  Outfront Media came forth later in the day to confess that they were behind the campaign to honor the late star.  Nimoy passed away on February 27th from chronic obstructed pulmonary disease.  He was 83.