Monday
Monday possesses a form of durability that transcends physical measurement. Every civilisation that has adopted the seven-day week has wrestled with Monday's persistence. The Babylonians formalised the weekly cycle around 600 BCE, and Monday has endured every subsequent attempt at calendar reform. The French Revolutionary Calendar, the Soviet five-day week, and various corporate experiments with alternative schedules have all failed to eliminate Monday.
Monday cannot be destroyed, postponed, or significantly altered. It regenerates with perfect reliability every 168 hours, surviving economic collapses, pandemics, and world wars without missing a single appearance.
Elephant
Individual elephants demonstrate remarkable longevity, with lifespans reaching 70 years in optimal conditions. Their thick, wrinkled skin provides protection against parasites and solar radiation, whilst their massive frames resist most predation attempts. Elephants have survived for 55 million years as a family, adapting through ice ages and continental drift.
However, elephant populations face significant pressures. The species numbered 26 million in the 1800s but has declined to approximately 400,000 today. Climate change, habitat loss, and poaching threaten long-term survival. Monday, by contrast, faces no existential threats whatsoever.