Here’s a very interesting story. Russian scientists found frozen seeds of a plant from 30 000 (A thin space is the recommended format for dividing numbers. 30,000 would really imply 30 with three significant figures.) years ago and have been found and they have managed to grow them. I’m not quite ready to write a long piece (although I have two in mind but am not sure when I will have time to write them) so I’m leaving the explanation to the capable Jerry Coyne.