Very old yeast: http://www.fossilfuelsbrewingco.com/

These guys are brewing a pale ale and a wheat beer with yeast
extracted from the gut of an insect fossilized in amber. The
45-million-year-old yeast strain appears to be an eocene ancester to
modern brewing yeast. Its metabolism is somewhat different from
today's variety in that it doesn't digest as wide a variety of sugars.
--

modom
** Posted from http://www.teranews.com **