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30 by 30 (or 30x30) is a worldwide initiative for governments to designate 30% of Earth's land and ocean area as protected areas by 2030. [1] [2] The target was proposed by a 2019 article in Science Advances , "A Global Deal for Nature: Guiding principles, milestones, and targets", highlighting the need for expanded nature conservation efforts ...
Saving Private Ryan is a 1998 American epic war film directed by Steven Spielberg and written by Robert Rodat.Set in 1944 in France during World War II, it follows a group of soldiers, led by Captain John Miller (), on their mission to locate Private James Francis Ryan and bring him home safely after his three brothers are killed in action.
The Thirty Years' War [j] was one of the longest and most destructive conflicts in European history, lasting from 1618 to 1648. Fought primarily in Central Europe, an estimated 4.5 to 8 million soldiers and civilians died as a result of battle, famine, or disease, while parts of present-day Germany reported population declines of over 50%. [19]
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...