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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. pianoman

    Do any birds migrate along an arc?

    Regarding the arc being the shortest distance between two points: That's really only when drawn on a flat map, which has to show a round globe on a flat surface, thus distorting the continents. On a Mercator projection map for instance, the shortest route looks like an arc, but that is...