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The technology of photography is an element chemical, part optical, and dates from 1839. Soon after its simultaneous invention by William Henry Fox Talbot in England and Louis Jacques Mand? Daguerre in France, photography was used to document foreign places of interest including India, the Holy Land, as well as the American West. It was also employed for portraits with photographs taken of kings, statesman, and theater or literary personalities. Speaking of mating season, that?s when you will hear essentially the most vocalization between frogs, by using a number of loud croak-like calls to draw potential mates. Each varieties of tree frog has his very own special call. Females hear select which call matches their species. The familiar ?ribbet? call, often imitated or used in the entertainment world, emanates from the Baja California tree frog. Darkness and light are themes that run heavily through Van Gogh's work. Darkness and light reflected his wish create beauty, his feelings of inadequacy, with his fantastic wish to touch the souls in men. For instance, Starry Night draws the viewer in to the painting of an sleeping village with its swirls of light and its rich evening sky. Though the concept of animal testing might seem trivial, tests are less simple as smearing cold cream or lip gloss for the face of the rabbit. Animals found in laboratory testing, often proceed through extremely painful experiments and millions die every year. Those that survive the experiments don't get set free, instead they may be euthanized. In cosmetic animal testing; rabbits, guinea pigs, mice and rats can be used. Tests are done on finished products and individual ingredients to look for the products amount of toxicity and power to cause eye or skin irritations, allergies along with other harmful effects.