designed as meteorite-storm early-warning systems. Encounters with cometary debris caused abrupt climate changes and rising sea-levels submerging Atlantis and many other ancient lands. The events of July 16th to 22nd 1994, when the remnants of a fragmenting comet, P/Shoemaker-Levy 9, bombarded the surface of Jupiter causing fireballs many times the size of our own planet, were an abrupt wake-up call even for those who were aware of them. The historical sciences generally, and arch