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The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored. Presence of at least 2 additional visual symptoms of the 4 following categories: i. Palinopsia. At least 1 of the following: afterimages or trailing of moving objects. ii.
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A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of ...
Description: Type: Photographs . Date: 1890 . Image ID: RU 31 Box 12 Folder 17 . Description: Wilson A. Bentley first became fascinated with snow during his childhood on a Vermont farm, and he experimented for years with ways to view individual snowflakes in order to study their crystalline structure.
The snowflakes were too complex to record before they melted, so he attached a bellows camera to a compound microscope and, after much experimentation, photographed his first snowflake on January 15, 1885. [5] He captured more than 5,000 images of crystals. Each crystal was caught on a blackboard and transferred rapidly to a microscope slide.
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The hexagonal snowflake, a crystalline formation of ice, has intrigued people throughout history.This is a chronology of interest and research into snowflakes. Artists, philosophers, and scientists have wondered at their shape, recorded them by hand or in photographs, and attempted to recreate hexagonal snowflakes.
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