Historical clue formulations

• Dr. Seuss book with the quote "Unless someone like you cares a whole awful lot, nothing is going to get better. It's not." — 2026-02-23
• Children's story with Truffula Trees — 2023-10-27
• Once-ler's opponent in a Dr. Seuss book — 2022-01-14
• Children's book made into a 2012 3-D animated film — 2020-02-23
• Classic book that begins "At the far end of town where the Grickle-grass grows ..." — 2019-04-12
• "You're glumping the pond where the Humming-Fish hummed!" — 2015-07-14
• Title Seuss character who speaks for trees — 2013-03-26
• Dr. Seuss book — 2012-09-15