Historical clue formulations

• Starting point — 2025-12-08
• Roots — 2022-02-19
• (0,0), in math — 2021-09-26
• Etymology, for example — 2020-09-12
• Darwin's "On the ___ of Species" — 2013-11-19
• (0,0), on a graph — 2012-01-22
• Where the x and y axes meet — 2010-06-03
• Intersection of the x and y axes — 2010-01-24
• (0,0) on a graph — 2009-03-24
• Ancestry — 2004-03-10
• Where the X-axis meets the Y-axis — 2003-10-06
• Graph spot — 2002-06-08
• Wellspring — 2002-01-17
• Roots — 2000-09-08
• (0,0) on a graph — 1999-10-06
• Beginning — 1998-12-29
• Beginning — 1998-02-26
• Source — 1996-12-22
• Fountainhead — 1996-04-16