Historical clue formulations

• Luminesce — 2026-02-09
• What fireflies and happy faces do — 2023-11-28
• Luminesce — 2023-03-07
• What the "angler" on a deep-sea anglerfish can do — 2022-12-30
• What crystal jellies do when disturbed — 2021-01-28
• Give off light, as a firefly — 2019-01-14
• Shine — 2017-04-09
• What fireflies do — 2016-05-17
• Radiant look — 2014-03-26
• ___ stick (trick-or-treater's accessory) — 2008-12-28
• U.F.O. feature, maybe — 2007-07-12
• Light from a lightning bug, e.g. — 2007-04-23
• Soft light — 2005-07-18
• Light from a halo — 2003-09-29
• Healthy look — 2002-09-08
• Radiation sign — 2001-06-09
• Moon shine — 2001-03-05
• Candle's light — 1999-11-24
• Gentle firelight — 1998-11-17
• Be visibly elated — 1998-11-15
• Ardor — 1995-10-15