Generations of fans of the long-running PBS staple *Reading Rainbow* most likely tuned in on the family TV. Now a growing generation of young readers can stream the reboot on YouTube, hosted by children’s librarian Mychal Threets, who started his career in the San Francisco Bay Area and is known to his more than 1 million followers across TikTok and Instagram as Mychal the Librarian. Threets broke through on social media with heartwarming videos that went viral in 2023. His message has balanced real talk about mental health with unwavering positivity, a message he’s now carrying over as honorary chair of National Library Week (April 19–25), with the theme “Find Your Joy.” He’s also featured on a new READ poster. He spoke with *American Libraries* about his path from hometown library to TikTok fame and beyond, and his debut picture book, *I’m So Happy You’re Here: A ­Celebration of Library Joy,* with illustrations by Lorraine Nam (Random House, February).…