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The colored arcs divide each edge in the golden ratio; when two tiles share an edge, their arcs must match. The golden ratio appears prominently in the Penrose tiling , a family of aperiodic tilings of the plane developed by Roger Penrose , inspired by Johannes Kepler 's remark that pentagrams, decagons, and other shapes could fill gaps that ...
The Electoral College was officially selected as the means of electing president towards the end of the Constitutional Convention due to pressure from slave states wanting to increase their voting power (since they could count slaves as 3/5 of a person when allocating electors) and by small states who increased their power due to the minimum of ...
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon 's radius. [32][33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel.
The satrapies handed out by Perdiccas at the Partition of Babylon became power bases each general used to bid for power. After the assassination of Perdiccas in 321 BC, Macedonian unity collapsed, and 40 years of war between "The Successors" ( Diadochi ) ensued before the Hellenistic world settled into three stable power blocs: Ptolemaic Egypt ...
They face each other and are located approximately 0.91 m (3.0 ft) above the floor, 2.5 m (8.2 ft) from the eastern wall, with a width of 18 and 21 cm (7.1 and 8.3 in) and a height of 14 cm (5.5 in). Both start out horizontally for the length of the granite blocks they go through before changing to an upwards direction.
In the second century AD, ... 10.3 (50.5) 10.6 (51.1) 12.4 (54.3) 16.1 (61.0) 20.9 (69.6) 25.6 ... divided in four regional units ...
Mercosur members were the main suppliers of imports to Chile at US$9.1 billion, followed by the United States with US$5.5 billion and the European Union with US$5.2 billion. From Asia, China was the most important exporter to Chile, with goods valued at US$3.6 billion.
The Earth's crust from the surface to 25 km (15 mi) down is calculated to contain 10 17 kg (2 × 10 17 lb) of uranium while the oceans may contain 10 13 kg (2 × 10 13 lb). [10] The concentration of uranium in soil ranges from 0.7 to 11 parts per million (up to 15 parts per million in farmland soil due to use of phosphate fertilizers ), [ 62 ...