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Radon

Radon is a radioactive gas formed in the decay of uranium that is a dangerous air pollutant. Radon typically enters a building through cracks in the foundation.

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Ramie fibre

Ramie fibre the perennial stalk producing plant has been cultivated in eastern Asia for fibre since prehistoric times. 3-8 feet high, with heart-shaped leaves, the plant’s texture was used in the fabric in ancient Egypt and was known in Europe during the Middle Ages.