Scenario planning is necessary because things happen all the time that have never happened before.
THINGS THAT HAD NEVER HAPPENED BEFORE THAT HAPPENED ON FEBRUARY 19:
356 AD: Constantius, Roman Emperor, orders all pagan temples closed in the Roman empire.
1859: Daniel E. Sickles, a New York Congressman, is the first person ever to be acquitted of murder by reason of temporary insanity.
1861: Serfdom is abolished in Russia.
1960: China launches its first rocket.
1985: The first artificial heart recipient leaves the hospital.