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By Frank van Steenbergen Noctilucent clouds seen over Amsterdam They are visible very, very rarely: lighting up in some nights, … Continued

By Frank van Steenbergen Postcard from KNSM-Eiland on a cold winter day. While the morning frost freeze-dries the moisture in the … Continued

By Frank van Steenbergen, Nancy Kadenyi and Luwieke Bosma Resistant to both waterlogged and dry conditions, not sensitive to salty … Continued