partial instability
51Down syndrome — Classification and external resources Boy with Down syndrome assembling a …
52Health aspects of Down syndrome — Down syndrome is a genetic disease resulting from the presence of all or part of an extra 21st chromosome (trisomy 21). The medical consequences of this extra genetic material are highly variable and may affect the function of any organ system or …
53Sri Lanka — Sri Lankan, adj., n. /sree lahng keuh, lang keuh, shree / an island republic in the Indian Ocean, S of India: a member of the Commonwealth of Nations. 18,762,075; 25,332 sq. mi. (65,610 sq. km). Cap.: Colombo. Formerly, Ceylon. Arabic, Serendip.… …
54Latin America, history of — Introduction history of the region from the pre Columbian period and including colonization by the Spanish and Portuguese beginning in the 15th century, the 19th century wars of independence, and developments to the end of World War II.… …
55Earnshaw's theorem — states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. This was first proven by Samuel Earnshaw in 1842. It is usually referenced to… …
56Equipartition theorem — [ Thermal motion of an α helical peptide. The jittery motion is random and complex, and the energy of any particular atom can fluctuate wildly. Nevertheless, the equipartition theorem allows the average kinetic energy of each atom to be computed …
57Corona — This article is about the astronomical term. For other uses, see Corona (disambiguation). During a total solar eclipse, the solar corona can be seen with the naked eye. A corona is a type of plasma atmosphere of the Sun or other celestial body,… …
58Origins of World War I — The origins of World War I included many factors, including the conflicts and antagonisms of the four decades leading up to the war. The immediate origins of the war lay in the decisions taken by statesmen and generals during the July crisis of… …
59List of cloud types — Clouds are formed in Earth s atmosphere when water evaporates into vapor from oceans, lakes, and ponds or by evapotranspiration over moist areas of Earth s land surface. The vapor rises up into colder areas of the atmosphere due to convective,… …
60Sovereign default — A sovereign default is the failure or refusal of the government of a sovereign state to pay back its debt in full. It may be accompanied by a formal declaration of a government not to pay (repudiation) or only partially pay its debts (due… …
