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Movements, leaders, victories and the continuing fight for equality.
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Movements, leaders, victories and the continuing fight for equality.
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Meet the people whose lives, choices and achievements shaped the journey.
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In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
Detect and avoid (DAA) is a set of technologies designed to avoid interference between a given emitter and the wireless environment.[1] Its need was generated by the Ultra-wideband (UWB) standard that uses a fairly large spectrum to emit its pulses.
According to the U.S. Federal Communications Commission (FCC), UWB can use from 3.1 to 10.6 GHz. That means it could interfere with WiMAX, 3G or 4G networks.[citation needed]
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Detect and avoid (DAA) is a set of technologies designed to avoid interference between a given emitter and the wireless environment. Its need was generated by the Ultra-wideband (UWB) standard that uses a fairly large spectrum to emit its pulses. According to the U.S. Federal Communications Commission (FCC), UWB can use from 3.1 to 10.6 GHz. That means it could interfere with WiMAX, 3G or 4G networks.
Poison shyness, also called conditioned food aversion, is the avoidance of a toxic substance by an animal that has previously ingested that substance. Animals learn an association between stimulus characteristics, usually the taste or odor, of a toxic substance and the illness it produces; this allows them to detect and avoid the substance. Poison shyness occurs as an evolutionary adaptation in many animals, most prominently in generalists that feed on many different materials. It is often called bait shyness when it occurs during attempts at pest control of insects and animals. If the pest ingests the poison bait at sublethal doses, it typically detects and avoids the bait, rendering the bait ineffective.
Malingee is a nocturnal malignant Australian Aboriginal spirit. In Aboriginal mythology, they prefer to avoid humans, but when provoked, they will slay mercilessly with a stone knife or axe. Malingees have knees of stone that knock together, making a scraping sound, and have eyes that smolder like the coals of a cold fire. These features were supposed to make it possible for humans to detect and avoid nearby Malingees.
An optionally piloted vehicle (OPV) or optionally piloted aerial vehicle is a hybrid between a conventional piloted aircraft and an unmanned aerial vehicle (UAV). Able to fly with or without a human crew on board the aircraft, OPVs are a low-cost alternative to UAVs in research, experimentation, and concept exploration, but may also become used in mainstream operations as familiarity with them increases. Unimpeded by a human's physiological limitations, an OPV is able to operate under more adverse conditions and/or for greater endurance times. Retaining on-board controls, the OPV can operate as a conventional aircraft during missions for which direct human control is preferred or desired as an immediate option. The US Naval Postgraduate School Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) in Monterey, California operates a highly modified Cessna 337-O2 Skymaster OPV called Pelican. The OPV provides a low-risk, low-cost test and evaluation alternative to a Predator UAV. The Pelican has also provided UAV support to military exercises which otherwise would not have had access to a real UAV due to cost, availability, or FAA restrictions. The Northrop Grumman Firebird is classified as an OPV. The National Test Pilot School certified an extensively modified Cessna 150 as an Optionally Piloted Aircraft for use as a training device to aid instruction of flight testing unmanned systems. Additionally, Autonodyne has operated an OPV Cessna 182 since 2018, which uses their onboard Avidyne Corporation to be piloted from the Autonodyne ground control software, relay communications between Air Traffic Control and the ground pilot, and autonomously detect and avoid hazardous traffic via wing-mounted cameras.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Joe Louis.
