Historical clue formulations

• Small test subjects — 2026-07-05
• Upper body muscles, for short — 2018-10-11
• Runners of experiments — 2013-01-01
• Ones caught in a maze? — 2008-08-24
• Test subjects — 2005-03-20
• Test group? — 2002-12-27
• They may be given test runs — 2000-02-11
• A-mazing animals — 1999-08-22