Historical clue formulations

• DNA pair — 2017-04-15
• Double helix parts — 2016-03-08
• Beaches, in two senses — 2015-12-12
• DNA structure — 2014-01-19
• Leaves high and dry — 2012-10-01
• Pearl sets — 2012-08-01
• Leaves high and dry — 2010-10-24
• DNA units — 2010-08-02
• Beaches — 2005-08-13
• Leaves in the lurch — 2005-07-04