A world's fair, also known as a universal exhibition, is a large global exhibition designed to showcase the achievements of nations. These exhibitions vary in character and are held in different parts of the world at a specific site for a period of time, typically between three and six months. The term "world's fair" is commonly used in the United States, while the French term.
Building on the , the Saxon engineer Carl Wolf developed a gasoline-powered capable of indicating impending explosions while shining brighter than previous designs and not giving off as much smoke as oil lamps did. In 1884, together with a business partner, Wolf founded Friemann & Wolf, or FrieWo. Initially based in a small workshop, the production quickly moved to a newl.
The Earth receives 174 (PW) of incoming solar radiation () at the upper . Approximately 30% is reflected back to space while the rest, 122 PW, is absorbed by clouds, oceans and land masses. The of solar light at the Earth's surface is mostly spread across the and ranges with a small part in the . Most of the world's population live in areas with insolation.
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