It is believed that Korean girls in the 17th century who were not allowed beyond the confines of their courtyard walls invented the seesaw to catapult themselves in the air high enough to glimpse the outside world, according to Patricia Newman.
A:Research suggests that the people of the Indus Valley civilization were peaceful. No weapons or other forms of protection from invaders or other civilizations were used. According to USHistory.org, no evidence of a military has been found in the remains of these ancient cities.
A:The Mayan people invented complex and highly accurate calendars based off astronomical readings. They are also believed to have discovered the technique of vulcanization, a process that strengthens rubber by adding other materials.
A:Little is known about the oldest eras of ancient Hebrew civilization because the culture was nomadic. The most distinct and long-lasting elements of ancient Hebrew civilization lay not in its architectural, artistic or diplomatic contributions but in the focus of the people on a monotheistic God who was radically different from the gods worshipped by most ancient peoples.
A:Charles Darwin is famous for the strong case he made in support of his theory of evolution. He showed how species changed over time, and proposed that all life resulted from evolution. His theory was controversial but eventually caught on with the scientific community.
A:"B.C." stands for "before Christ," while "A.D." stand for "anno domini," meaning "in the year of our Lord," according to How Stuff Works. This way of delineating the calendar was established in the 5th century.
A:The four staple foods in Mayan cuisine are squash, beans, maize and chili peppers, and they were often combined with meat or seafood. Squash, beans and maize are often referred to as the "three sisters" because they provide all the necessary nutrients when eaten together.
A:The Hubble Space Telescope was invented by Lyman Spitzer, who first proposed the concept in 1946. Spitzer, a native of Toledo, Ohio, continued analyzing photos from the Hubble Space Telescope until his passing in 1997.
A:Stephen Hawking is most famous for his theory about black holes. The theory hypothesizes that black holes release matter in the form of radiation. He is also renowned for his book "A Brief History of Time."
A:Paper money was used first by the Chinese during the Tang Dynasty (A.D. 618 to 907). According to Time, the first forms of paper money were privately issued bills of credit or exchange. This practice continued for about 500 years.
A:J.P. Lemiere invented the first "binocular telescope" in 1825. A binocular is an instrument that provides a magnified view of far-away objects and consists of two similar telescopes, one for each eye, mounted in a single frame.
A:The Greek astronomer Hipparchus was the first to propose a day divided into 24 equal hours. Hipparchus standardized this system from the Egyptians, who also divided the day into 24 hours but did not use a standard length for each hour.
A:Two major effects of the Crusades were that the kings' authority increased and the Europeans learned about new things from the Muslims they encountered. During the Crusades, the kings increased taxes to fund the cause. Many peasants also left their land to fight, and when they died, the land went to the king. With large amounts of money and land coming in, the kings gained power.
A:The crusades were ultimately won in the East by the Muslims when the Bahri Mamluks conquered Acre in 1291. While crusades were mounted even after this point, political witch-hunts mounted against the Knights Templar by King Philip IV of France made further major crusades in the Levant impractical.
A:Negative effects of the Crusades included the repeated defeats of the Christian armies, the slaughter of innocents and the looting of Constantinople. The destruction of Constantinople severed any hope of mending the East-West schism in Christianity, and this event left the Byzantine Empire vulnerable to the Ottoman Empire.
A:The Vikings invented the longboat during the Vikings Age from 800 to 1100 A.D. This type of ship helped them travel the oceans to reach France, England, Scotland, Greenland, Iceland, Ireland, Vinland and the Middle East. Thus, they became a dominant force in European medieval trade, politics and warfare.
A:Marco Polo and his family traveled through Asia to bring a letter from the Pope, Christian scholars and oil from the lamp at the Holy Sepulchre to Kublai Khan. Kublai Khan was the Great Khan of the Mongol Empire. As merchants, they also conducted business along the way.
A:Apartheid is a form of racial segregation that has its roots in South Africa. Under this system of segregation, South Africans were divided into groups of whites and nonwhites. Apartheid was introduced in 1948 under the governance of the National Party, which was a system of government run by all-white officials.
A:Nelson Mandela fought to end apartheid, which divided people in South Africans based on race. After his release from prison, he sought reconciliation. He is credited with helping South Africa move past its unjust history.
A:Royal Navy Captain James Cook died on February 14, 1779, after he was stabbed in a scuffle with Hawaiian islanders when he attempted to take the local leader hostage. His death occurred during his third exploratory voyage on the HMS Endeavour.
A:South Africa gained its independence from Great Britain in 1934, though the African National Congress, which was formed 22 years prior to South Africa gaining its independence, did not gain power until 1994.
A:Sigmund Freud, the creator of psychoanalysis, was one of the first doctors to research and write about the unconscious mind and repressed memories. Freud believed that psychological problems could manifest as physical symptoms.