Curated category
Insulators
- Down featherThe down feather lacks the interlocking barbules found in pennaceous feathers, making it soft and fluffy. It has a short or vestigial rachis with few barbs.
- Insulated glazingIn 1877, Henry Seebohm observed a practical necessity in the Yeniseysk area of Siberia. Winter temperatures there regularly fell below negative fifty degrees…