Skyscrapers in the CTBA (Cuatro Torres Business Area) in Madrid, Spain. The one in the foreground is the Torre Caja Madrid (250 metres). Partially seen behind it is the Torre PwC (236 metres, formerly the Torre Sacyr Vallehermoso). The two skyscrapers in the background at lower right are the Torre de Cristal (left, 249.5 metres) and the Torre Espacio (right, 224.5 metres). Collectively they are known as Cuatro Torres (the Four Towers), and the business area is named after them. They are the tallest skyscrapers in Madrid, and were completed between 2007 and 2008. Photographed in 2011.
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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