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- Dr. Mercola 脂質體維他命C
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Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits, berries and vegetables. It is also a generic prescription medication and in some countries is sold as a non-prescription dietary supplement. As a therapy, it is used to prevent and treat scurvy, a disease caused by vitamin C ...
- C₆H₈O₆
- Ascor, Cecon, Cevalin, others
In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.
- The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c).
- Theorem
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Charles Robert Darwin FRS FRGS FLS FZS JP [6] ( / ˈdɑːrwɪn / [7] DAR-win; 12 February 1809 – 19 April 1882) was an English naturalist, geologist and biologist, [8] widely known for his contributions to evolutionary biology. His proposition that all species of life have descended from a common ancestor is now generally accepted and ...
- Names
- History
- Course
- Characteristics
- Condition
- Visibility from Space
- Gallery
- External Links
The collection of fortifications known as the Great Wall of China has historically had a number of different names in both Chinese and English. In Chinese histories, the term "Long Wall(s)" (t 長城, s 长城, Chángchéng) appears in Sima Qian's Records of the Grand Historian, where it referred both to the separate great walls built between and north of th...
Early walls
The Chinese were already familiar with the techniques of wall-building by the time of the Spring and Autumn period between the 8th and 5th centuries BC. During this time and the subsequent Warring States period, the states of Qin, Wei, Zhao, Qi, Han, Yan, and Zhongshanall constructed extensive fortifications to defend their own borders. Built to withstand the attack of small arms such as swords and spears, these walls were made mostly of stone or by stamping earth and gravel between board fra...
Ming era
The Great Wall concept was revived again under the Ming in the 14th century, and following the Ming army's defeat by the Oirats in the Battle of Tumu. The Ming had failed to gain a clear upper hand over the Mongol tribes after successive battles, and the long-drawn conflict was taking a toll on the empire. The Ming adopted a new strategy to keep the nomadic tribes out by constructing walls along the northern border of China. Acknowledging the Mongol control established in the Ordos Desert, th...
Foreign accounts
None of the Europeans who visited China or Mongolia in the 13th and 14th centuries, such as Giovanni da Pian del Carpine, William of Rubruck, Marco Polo, Odoric of Pordenone and Giovanni de' Marignolli, mentioned the Great Wall. The North African traveler Ibn Battuta, who also visited China during the Yuan dynasty c.1346, had heard about China's Great Wall, possibly before he had arrived in China. He wrote that the wall is "sixty days' travel" from Zeitun (modern Quanzhou) in his travelogue G...
A formal definition of what constitutes a "Great Wall" has not been agreed upon, making the full course of the Great Wall difficult to describe in its entirety.The defensive lines contain multiple stretches of ramparts, trenches and ditches, as well as individual fortresses. In 2012, based on existing research and the results of a comprehensive map...
Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood. During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone. The size and weight of the bricks made them easier to work with than earth and stone, so construction quickened. Additionally, ...
While portions north of Beijing and near tourist centers have been preserved and even extensively renovated, in many other locations the wall is in disrepair. The wall sometimes provided a source of stones to build houses and roads. Sections of the wall are also prone to graffiti and vandalism, while inscribed bricks were pilfered and sold on the m...
Various factoidsin popular culture claim that the Great Wall can be seen (with the naked eye) from space, with questionable degrees of veracity.
The Great Wall at BadalingThe Great Wall at dawnThe Juyongguan area of the Great Wall accepts numerous tourists each day.Remains of Beacon tower, near Yumenguan, 2011International Friends of the Great Wall Archived February 17, 2009, at the Wayback Machine– organization focused on conservationGreat Wall of China on In Our Time at the BBCBenedict Timothy Carlton Cumberbatch CBE (born 19 July 1976) is an English actor. Known for his work on screen and stage, he has received various accolades, including a BAFTA TV Award, a Primetime Emmy Award and a Laurence Olivier Award, in addition to nominations for two Academy Awards and four Golden Globes. In 2014, Time magazine named him ...
A proton is a stable subatomic particle, symbol. p. , H +, or 1 H + with a positive electric charge of +1 e ( elementary charge ). Its mass is slightly less than the mass of a neutron and 1,836 times the mass of an electron (the proton-to-electron mass ratio ). Protons and neutrons, each with masses of approximately one atomic mass unit, are ...
Shogun (English: /ˈʃoʊɡʌn/ SHOH-gun;[1] Japanese: 将軍, romanized: shōgun, pronounced [ɕoːɡɯɴ] ⓘ), officially sei-i taishōgun (征夷大将軍, "Commander-in-Chief of the Expeditionary Force Against the Barbarians"),[2] was the title of the military rulers of Japan during most of the period spanning from 1185 to 1868.[3 ...
