Historical clue formulations

• Discovered, British-style — 2023-03-01
• Mastered, British-style — 2017-09-03
• Picked up, in Britain — 2013-12-15
• Found out, British-style — 2010-11-10
• Found out, British-style — 2008-09-23
• Picked up — 2006-05-12
• Absorbed, in a way — 2005-11-09
• Found out — 2003-06-14
• Discovered — 1999-10-29
• Memorized — 1996-08-29