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Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...
Raycom Sports is a Charlotte, North Carolina –based producer of sports television programs owned by Gray Television . It was founded in 1979 by husband and wife, Rick and Dee Ray. In the 1980s, Raycom Sports established a prominent joint venture with Jefferson-Pilot Communications which made them partners on the main Atlantic Coast Conference ...
ESPN (an abbreviation of its original name, the Entertainment and Sports Programming Network [2]) is an American international basic cable sports channel owned by The Walt Disney Company (80% and operational control) and Hearst Communications (20%) through the joint venture ESPN Inc. The company was founded in 1979 by Bill Rasmussen, Scott ...
Therefore, the test correctly identifies 80% of non-use for non-users, but also generates 20% false positives, or false positive rate (FPR) = 0.20, for non-users. Assuming 0.05 prevalence, meaning 5% of people use cannabis, what is the probability that a random person who tests positive is really a cannabis user?
Israel, officially the State of Israel, is a country in the Southern Levant region of West Asia.It is bordered by Lebanon to the north, Syria to the northeast, Jordan to the east, the Red Sea to the south, Egypt to the southwest, the Mediterranean Sea to the west, and the Palestinian territories – the West Bank along the east and the Gaza Strip along the southwest.
Development XV-15 experimental tiltrotor, 1980 Early concept illustrations of V-22 In the late 20th century VTOL aircraft gained popularity, and many prototype designs were developed, but only one entered service; the Harrier fighter/attack jet used a turbo fan engine. A practical tilt-rotor remained more elusive, until finally in the 1980s the United States moved forward with V-22 design ...
Google LLC The Google logo used since 2015 Google's headquarters, the Googleplex Formerly Google Inc. (1998–2017) Company type Subsidiary Traded as NASDAQ: GOOGL, GOOG Industry Internet Cloud computing Computer software Computer hardware Artificial intelligence Advertising Founded September 4, 1998 ; 25 years ago (1998-09-04) [a] in Menlo Park, California, United States Founders Larry Page ...
A tuner for recording off-air television programmes. A clock with timer for unattended recordings. A modulator to allow connection to a normal (for the time) television receiver without audio and video input connectors. The Philips VCR system was marketed only in the U.K., mainland Europe, Australia and South Africa.