Link: NPR Fresh Air: To this day, they are the most efficient insulation known. We haven’t…

nprfreshair:

To this day, they are the most efficient insulation known. We haven’t been able to match them with synthetics, and I think it boils down to that growth process and the fact that you can make these fine, fine branching structures. The key to insulation is what they call loft — how much air…

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