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Why was Rosa Parks so important?

In Montgomery in 1955, city buses were segregated, with whites sitting in the front half of the bus and blacks in the back. Rosa Parks, after a long day of work, boarded the bus and sat in the front row of the black section. When the bus filled up with white people, the driver ordered Parks and some other blacks to move back. The others obeyed, but Parks refused. In retaliation, the driver stopped the bus and had Parks arrested. On the day of Parks' trial in December, the local head of the NAACP asked black people to stay off the buses in protest, and as the boycott seemed to be effective..

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How long did it take to build the Panama Canal?

The most challenging aspect associated with the excavation of the Panama Canal was the removal of a continental divide comprised of hard rock. The divide rose 100 meters above sea level. The excavation through the divide is known as the Culebra Cut.\nOnce complete, the canal cut roughly 7,800 miles off the sea journey from New York to San Francisco.

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How do water clocks work?

Time is measured with an outflow water clock by filling a vessel with water and slowly draining it away at as even a rate possible. Markings inside the vessel are observed to gage how much time passes. According to FactMonster.com, this type of water clock is similar to the clepsydras used in ancient Greece around 325 B.C. Greek clepsydras were stone bowls with sloping sides that permitted water to drip at a nearly constant rate from a small hole near the bottom.\nAn inflow water clock works in the reverse manner as the outflow model. This type of water clock uses liquid to fill up a container..

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Who discovered matter?

Following Empedocles' ideas, the concept of dividing all things until they could not be divided into smaller sub-parts came about, giving rise to the earliest theories about atoms. Democritus was the philosopher who articulated this concept and named these parts "atomos." He stated that the atomos could not be destroyed, and that the atomos particles that make up one material, such as stone, are different from the atomos that make up another material, like fur.Since the ancient Greek era, modern discoveries have shaped the concept of matter as it is known today. In 1643, Evangelista Torri..

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What are some examples of emerging technologies?

Body adapted wearable electronics include biometric-sensing earbuds and bracelets, portable sensors that track posture, and tattoos that track vital signs. Haptic shoes that could help the blind navigate through GPS are being created by the emerging ophthalmology company Lechal, as of 2015.\nNanostructured composites that utilize nano-allotropes of carbon, such as C60 and carbon nanotubes, are extremely light and strong, promising to reduce the weight of cars by 10% or more while improving vehicle strength and integrity. This reduction in weight promises to increase fuel consumption efficiency..

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Why was Malcolm X famous?

Malcolm X had a tumultuous childhood in which his father was murdered by a racist group called the Black Legion. He was jailed for six years when he was 21 years old, where he studied teachings of the Black Muslims, an extremist Black and Islamic group. He adopted their beliefs and actively taught them after his release from prison as the minister of Temple No. 7 in Harlem, New York. The beliefs contrasted Martin Luther King, Jr.'s anti-violent philosophy. It advocated the opposition of racism through any means necessary.\nMalcolm X eventually left the Black Muslims, believing they were i..

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Why do people celebrate Martin Luther King Jr. Day?

Martin Luther King, Jr. Day, which is a federal holiday in the United States, is observed on the third Monday of each January, which falls on or near King's birthday of January 15. Schools are closed across the country, but many of them still organize assemblies and projects to honor Dr. King.\nMartin Luther King, Jr. lead the Civil Rights Movement in the most peaceful way possible, promoting non-violent activism while protesting racial inequality and discrimination at both state and federal levels. After his assassination in 1968 and in honor of his efforts, a campaign for the holiday be..

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How long did the former Soviet Union last?

Prior to the revolution in 1989 after Gorbachev's policy changes, the Communist Party indirectly controlled all areas and levels of government. The early years of the Soviet Union saw many changes, including government taking on the industrial and agricultural sectors. There were points during Stalin's rule where people were taken to labor camps or killed for speaking out against the Communist Party or its rulers.

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How long was the Vietnam War?

The United States became involved in Vietnam shortly after World War II, sending funds and military advisers to aid the French. In 1954 the French were beaten and conceded defeat. On Nov. 1, 1955, the United States established the Vietnam Military Assistance Advisory Group to send military advisers to train and guide the South Vietnamese army and anti-communist forces directly. On April 30, 1975, North Vietnam captured the South Vietnamese capital of Saigon. The United States vacated the city the night before.

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When did dinosaurs roam the earth?

The three ages of the dinosaurs include the Triassic, Jurassic and Cretaceous. These periods fall under the Mesozoic Era, which lasted from 250 to 65 million years ago. Dinosaurs evolved from lizards known as archosaurs, having developed quadrupedal or bipedal posturing. It's believed that reptiles began exhibiting dinosaur and archosaur traits during the middle of the Triassic. Early dinosaurs can be categorized as therapods, bird-hipped dinosaurs and herbivores, among other categories. Therapods evolved into tyrannosaurs, Allosaurus, dino-birds and raptors. Herbivore dinosaurs existed i..

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