Butter Keeper vent opener The Year-Round Solar Greenhouse is

The Year-Round Solar Greenhouse is the one-stop guide to designing and building greenhouses that harness and store energy from the sun to create naturally heated

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Want to learn more about how communities can produce their own clean

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Butter Keeper vent opener The Year-Round Solar Greenhouse isA butter lover's dream! Once you start using this Butter Keeper, you won't settle for hard butter again! Holding one stick of butter, the water in the base seals out the air to keep the butter soft, sweet, and spreadable for up to 30 days without refrigeration! Simply pour approximately 1 2" of water into the basin, fill the top of the butter keeper with butter, turn it upside down so the water covers the top of the butter, and presto! Soft, sweet,