Historical clue formulations

• Come back in — 2026-02-08
• Come back in — 2024-03-19
• Confirm, as an email address — 2020-03-12
• Come again? — 2015-03-06
• Show one's stamped hand, perhaps — 2011-09-17
• Type in again, as a password — 2011-02-27
• ... you may have to ___ it — 2010-03-26
• Verify, as a password — 2009-01-30
• What a stamped hand may allow you to do — 2008-12-14
• Catalog anew — 2004-03-20
• What astronauts do to the atmosphere — 2000-11-17
• One might do it after being stamped — 2000-08-11
• Type in again — 1999-03-11
• Take part in again — 1996-10-19
• Join anew — 1996-02-09
• Come back into, as the atmosphere — 1996-01-22
• Type in again — 1995-04-16
• Join again — 1994-08-05