Apropos of nothing in particular, but it's the truth - in the 13th century there was only one Plague reservoir - Central Asia, where the rats and the fleas had come to a stasis that remains today. Today we have two Plague reservoirs. The second one was created in the 19th century - it's the Southwestern United States.
Sleep tight, kiddies...
110,000 years ago, at the end of the last interglacial (global warming) period, hippopotami frolicked in the Thames, elephants in Trafalger Square and lions at Charing Cross.