SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Water droplets on grass. Surface tension prevents the droplets collapsing, but only if they are less than a certain size. Larger droplets will roll off the grass, but these small droplets are held in place by friction on the rough surface. Droplets like these form early and late in the day, before the heat of the Sun evaporates them, or after a period of rainfall. They are an important source of water for microscopic animals and other animals restricted to a small area. The stems with spiky leaves are the common hair cap moss (Polytrichum commune). Photographed in Hesleyside Park SSSI, Northumberland National Park, England.
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