2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7684The number in the title is a birthday-inspired overestimate by about an order of magnitude. Nevertheless, this contribution reminds of well-known reasons that prevented straightforward explosions in many numerical supernova models. It emphasizes a separation between the two events of core collapse and supernova explosion.5 pages, 2 figures, to appear in Proceedings of the 12th Workshop on "Nuclear Astrophysics" held at Ringberg Castle, March 22-27, 2004Astrophysicstext