Get smiles and comments from chemistry fans with this themed Funny Serotonin Science Chemistry Gift notebook planner. Perfect funny gag gift journal or diary snarky gift for people who love science and the happiness hormone which is serotonin. Combine with a shirt or hoodie for extra oomph. Blank lined 20 lines per page, 120 pages, 6x9 inches, matte-finished cover, and white paper. Check out the author's expanded journal diary gift collection.