Logical empiricism (also logical positivism or neopositivism) was an early 20th-century attempt to synthesize the essential ideas of British empiricism (e.g. a strong emphasis on sensory experience as the basis for knowledge) with certain insights from mathematical logic that had been developed by Gottlob Frege and Ludwig Wittgenstein. Some of the key figures in this movement were Otto Neurath, Moritz Schlick and the rest of the Vienna Circle, along with A.J. Ayer, Rudolf Carnap and Hans Reichenbach.
When was logical empricism formulated?
early 20th-century

Tajikistan has a population of 7,349,145 (July 2009 est.) of which 70% are under the age of 30 and 35% are between the ages of 14 and 30. Tajiks who speak Tajik (a dialect of Persian) are the main ethnic group, although there are sizable minorities of Uzbeks and Russians, whose numbers are declining due to emigration. The Pamiris of Badakhshan, a small population of Yaghnobi people, and a sizeable minority of Ismailis are all considered to belong to the larger group of Tajiks. All citizens of Tajikistan are called Tajikistanis.
What is Tajikistans population as of July 2009?
7,349,145

A number of decoy towns were constructed in Somerset in World War II to protect Bristol and other towns, at night. They were designed to mimic the geometry of "blacked out" streets, railway lines, and Bristol Temple Meads railway station, to encourage bombers away from these targets. One, on the radio beam flight path to Bristol, was constructed on Beacon Batch. It was laid out by Shepperton Studios, based on aerial photographs of the city's railway marshalling yards. The decoys were fitted with dim red lights, simulating activities like the stoking of steam locomotives. Burning bales of straw soaked in creosote were used to simulate the effects of incendiary bombs dropped by the first wave of Pathfinder night bombers; meanwhile, incendiary bombs dropped on the correct location were quickly smothered, wherever possible. Drums of oil were also ignited to simulate the effect of a blazing city or town, with the aim of fooling subsequent waves of bombers into dropping their bombs on the wrong location. The Chew Magna decoy town was hit by half-a-dozen bombs on 2 December 1940, and over a thousand incendiaries on 3 January 1941. The following night the Uphill decoy town, protecting Weston-super-Mare's airfield, was bombed; a herd of dairy cows was hit, killing some and severely injuring others.
What did the decoy towns mimic
mimic the geometry of "blacked out" streets, railway lines, and Bristol Temple Meads railway station, to encourage bombers away from these targets