This week "On Second Thought" celebrates three years on the air. The show launched October 20, 2014. To celebrate, we’re re-airing a few of our best segments. Do you have a favorite segment or episode? Let us know. Actor George Takei first came to fame as a young Sulu in the original Star Trek series. But he’s since become an active voice in promoting equal rights for LGBT people. We spoke to Takei earlier this year when the play “Allegiance,” was showing in Atlanta movie theaters. The play is