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Very interesting article about the viability of some very old seeds found in a squirrel stash in Siberia. Brings Jurassic Park a little bit closer to home!
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2012/02/20/MNKU1NA41R.DTL&tsp=1
Not sure about mammoths though.
Why farms want cold winters | Grist,
First, the deep, killing, subfreezing cold of winter typically eliminated many damaging insects and pathogens.... Beyond killing the baddies, proper cold serves another important purpose: For perennial crops, shorter days and sustained low temperatures bring a cycle of dormancy, a deep, almost anesthetized sleep, during which growth is temporarily halted.
Go read...
