History Detectives launches its eighth season Monday (June 21) with a live Tweetfest. Viewers get to chat with the show’s investigative team while watching the broadcast, which attempts to answer questions including: Is Andy Warhol’s art on the moon? (Spoiler alert! Answer here.) Use hashtag #histdet_pbs, or check out the show’s custom TweetGrid. The team will be online for two back-to-back sessions so viewers across the country may participate.