Historical clue formulations

• Poses a danger to — 2020-01-12
• Poses a danger to — 2016-05-18
• Killer bees and others — 2014-07-29
• Saber rattlers — 2011-01-07
• Poses a danger to — 2005-04-14
• Threatening sorts — 2003-04-09
• Perils — 2001-04-26
• Saber rattlers — 1999-11-19
• What Dennis does to Mr. Wilson — 1998-03-16