A little off-topic, but not much:
Years ago, I remember reading about one of the world's great beers, Pilsner Urqell from Chekoslovakia (I probably misspelled that). The article said that it is brewed with a yeast culture that has been maintained for over 1300 years! (I read it a long time ago - maybe it was since the 13th century, but I think the 1300 years figure is the correct one). It has been nurtured and protected throughout not a few wars and other upheavals.
It that is true, it amazes me.