Historical clue formulations

• Poison — 2021-06-29
• Snake venom, e.g. — 2018-12-03
• Cause of a bee sting's sting — 2018-06-06
• Benzene or lead — 2017-04-15
• Venom, e.g. — 2016-03-17
• Scorpion's defense — 2015-11-18
• Sickening thing — 2015-03-07
• Botulin, e.g. — 2012-05-06
• Botulin, e.g. — 2008-02-10
• Poison — 2005-07-25
• Poison — 2003-04-28
• Snake venom, e.g. — 2003-03-06
• Poison — 2003-03-05
• Venom — 2001-08-08
• Antidote target — 1997-10-22
• Venom, for one — 1996-07-29
• Botulin, e.g. — 1994-09-23
• Poison — 1993-12-16