Unripe cashew nut. Image 1 of 2. Native to South America, the cashew (Anacardium occidentale) is now widely cultivated throughout the tropics. Cashew trees produce a fruit, known as an 'apple' (centre), and a nut (lower centre). The nut forms before the fruit swells and ripens, which takes two months. Once harvested, the fruit is often discarded in favour of the nut, although it can be used to make jellies, jams and juice. The nut must be removed from its shell with care, as the shell contains an allergen that can cause dermatitis. Cashew nuts are used in a variety of sweet and savoury recipes. Photographed in Grenada. See B790/238 for a ripe cashew nut.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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