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April 27, 2016

A 1917 astronomical photographic plate spectrum of the star Van Meenen from the Carnegie Archives. The pull-out box shows the strong lines of the element calcium, which is surprising to see in a century-old spectrum. The spectrum is a thin (mostly) dark line in the center of the image. The broad dark spurs above and below the spectrum line originate from the bulbs used at the time to calibrate the image. In this image they appear in contrast to highlight the two emission lines missing from the star. Photo: Carnegie Institution for Science

A 1917 photographic plate reveals the first ever evidence of an extrasolar planetary system

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The off switch for genetically modified organisms

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Language and Dyslexia Part Three of Chapter 12 in the book "Behind the Scenes of the Brain Show"

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