So the knowledge was there, sitting at the back of my mind, waiting to come true, when the doctor told me.

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Long before I studied finance formally, my mother told me a story when I was young that became imprinted on my mind, and I still enjoy retelling it today.

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"That was what made everything so real to me this morning, and so vivid in my mind, " Mrs Lea told the BBC.

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"When we looked at them in detail and brought them to the lab, I could see some of the stems actually had new growth of green lateral branches, and that said to me that these guys are regenerating in the field, and that blew my mind, " she told BBC News.

BBC: Centuries-old frozen plants revived