This delightful image features a double rainbow arcing over the Lucas Center at Stanford. As noted in this Encyclopedia Britannica description, secondary rainbows result from light that has undergone two internal reflections within the water drop and have a reversed color sequence compared to the more color-intense primary bow. The photo was captured on Feb. 13 by Atul Butte, MD, PhD, an associate professor of systems medicine in pediatrics at Stanford.
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