...errr...not Kotter.
http://news.yahoo.com/giant-virus-resurrected-permafrost-30-000-years-202120390.html
http://news.yahoo.com/giant-virus-resurrected-permafrost-30-000-years-202120390.html
I remember reading about these. Quite creepy if you ask me.
I remember hearing years ago (possibly an urban myth) about an academic researcher who cut his thumb on a medieval manuscript, and ended up having it amputated because the cut became infected by some long-extinct medieval bacteria.