The episode is known as the Younger Dryas, because in Scandinavia abundant pollen from a tundra flower called the mountain avens, Dryas octopetala, reappears in soil from this date, indicating that the forest had once more given way to tundra.

WSJ: Matt Ridley on New Support for a Global-Cooling Theory | Mind & Matter

The only thing we weren't sure of was the exact on-sale date, but even that got leaked when a Canadian retailer put up a pre-order page indicating the two products would ship January 29th.

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