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Featured Article: Colombia

Colombia, officially the Republic of Colombia, is a country located in the northwestern region of South America. It is bordered to the east by Venezuela and Brazil, to the south by Ecuador and Peru, to the north by the Atlantic Ocean (through the Caribbean Sea), and to the west by Panama and the Pacific Ocean. It is the only South American country with both Atlantic and Pacific coasts.

Popular Article: Proterozoic

Four main Proterozoic events. From left to right: Great Oxidation Event and subsequent Huronian glaciation; First eukaryotes, like red algae; Snowball Earth in Cryogenian period; Ediacaran biota

The Proterozoic eon is an interval of geologic time of nearly 2 billion years extending from about 2500 million years ago (mya) to about 542 mya. The Proterozoic eon is framed at its earliest boundary by the end of the Archean eon and at its more recent boundary by the start of the Phanerozoic eon, which begins with the appearance of abundant macroscopic hard-shelled animals in the fossil record and extends to the present time.

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The term "military-industrial complex" was first used publicly by Dwight D. Eisenhower in his farewell address on January 17, 1961 (source: Military-industrial complex)

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