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lock and key

(Encyclopedia)lock and key, fastening fitted to an entryway, such as a gate or door, or a container, such as a cabinet, drawer or safe, to keep it closed and/or prevent unauthorized access or use. Locks typically c...

lead, chemical element

(Encyclopedia)lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502℃; b.p. about 1,740℃; sp. gr. 11.35 at 20℃; valence +2 or +4. One of the oldest metals used by h...

utility, public

(Encyclopedia)utility, public, industry required by law to render adequate service in its field at reasonable prices to all who apply for it. Public utilities frequently operate as monopolies in their market. In th...

Putin, Vladimir Vladimirovich

(Encyclopedia)Putin, Vladimir Vladimirovich vlŭdēmˈyĭr vlŭdēmˌyĭrˈəvyĭch po͞oˈtyĭn [key], 1952–, Russian government official and political leader, b. Leningrad (now St. Petersburg). After graduating...

chemical warfare

(Encyclopedia)chemical warfare, employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive ty...

marriage

(Encyclopedia)marriage, socially sanctioned union that reproduces the family. In all societies the choice of partners is generally guided by rules of exogamy (the obligation to marry outside a group); some societie...

space medicine

(Encyclopedia)space medicine, study of the medical and biological effects of space travel on living organisms. The principal aim is to discover how well and for how long humans can withstand the extreme conditions ...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

Truman, Harry S.

(Encyclopedia)Truman, Harry S., 1884–1972, 33d President of the United States, b. Lamar, Mo. Truman remained active in politics for many years after his retirement, campaigning around the country for Democrat...

Japan

(Encyclopedia)CE5 Japan jəpănˈ [key], Jap. Nihon or Nippon, country (2015 est. pop. 127,975,000), 145,833 sq mi (377,835 sq km), occupying an archipelago off the coast of E Asia. The capital is Tokyo, which, ...