File:Kristian Birkeland and his wife (cropped).jpg
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![File:Kristian Birkeland and his wife (cropped).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/88/Kristian_Birkeland_and_his_wife_%28cropped%29.jpg/800px-Kristian_Birkeland_and_his_wife_%28cropped%29.jpg?20171125102134)
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Original file (3,541 × 2,615 pixels, file size: 2 MB, MIME type: image/jpeg)