1 . The days when art was an Olympic sport

Did you know that creating works of art used to be an Olympic competition?     1     In the first year, Walter Winans became the first and the only Olympian to win medals for both art and sports. Despite this seemingly optimistic start, the idea of the arts being included in the Olympic Games soon met with disinterest, finally resulting in the removal of the art competition from the Olympic Games.

The idea to include art in the Olympics came from Baron Pierre de Coubertin, who was the founder of the International Olympic Committee, which created the modern Olympics. Coubertin believed that the arts and sports were linked and was impressed by anyone who had a firm command of both a sport and an artistic discipline(项目).

For starters, only amateurs were allowed to compete in the arts part of the Olympics.     3     Having artists of average quality competing while only the most competent athletes were allowed to compete created a dramatic divide and gave the impression that the arts were not as important as sports.

Secondly, works of art created had to have sports as the subject matter.     4     Limiting the subjects also contributed to making the arts part of the Olympic Games boring to the general public.

Finally, one of the biggest reasons was that the arts are subjective. Sports can be judged by time and distance, making it easy to determine who is the winner.     5     This difficulty in judging a definite winner resulted in the arts part becoming a non-competitive exhibition that ran for the duration of the Olympic Games.

2 . While DNA from animal bones or teeth can cast light on an individual species, environmental DNA enabled scientists to build a picture of a whole ecosystem.

A core of ice age sediment (沉积物) from northern Greenland has yielded the world’s oldest sequences of DNA. The 2 million-year-old DNA samples revealed the now largely lifeless polar region was once home to rich plant and animal life — including elephant-like mammals known as mastodons (乳齿象), reindeer, hares, lemmings, geese, birch trees and poplars, according to new research published in the journal Nature on Wednesday.

The finding is the work of scientists in Denmark who were able to detect and restore environmental DNA — genetic material drop into the environment by all living organisms — in tiny amounts of sediment taken from the Copenhagen Formation, in the mouth of a strait in the Arctic Ocean in Greenland’s northernmost point, during a 2006 expedition.

They then compared the DNA pieces with libraries of DNA collected from both extinct and living animals, plants and microorganisms. The genetic material revealed dozens of other plants and creatures that had not been previously detected at the site based on what’s known from fossils and pollen records.

“The first thing that blew our mind when we’re looking at this data is obviously this mastodon and the presence of it that far north, which is quite far north of what we knew as its natural range,” said study co-author Mikkel Pedersen.

The mix of temperate (温带) and Arctic trees and animals suggested a previously unknown type of ecosystem that has no modern equivalent — one that could act as a genetic road map for how different species might adapt to a warmer climate, the researchers found.

Love Dalen, a professor at the Centre for Palaeogenetics at Stockholm University, said the finding “pushed the envelope” for the field of ancient DNA. “Also, the findings that several temperate species (such as relatives of spruce and mastodon) lived at such high latitudes are exceptionally interesting,” he added.

Further study of environmental DNA from this time period could help scientists understand how various organisms might adapt to climate change. “It’s a climate that we expect to face on Earth due to global warming and it gives us some idea of how nature will respond to increasing temperatures,” he explained.

4 . Scientists have solved a puzzle about modern humans, after research showed that a famous skull of a human ancestor found in South Africa is a million years older than experts thought. This discovery has changed what we know of human history.

The skull, which scientists have named “Mrs Ples”, is from an ape-like human relative from a species called Australopithecus africanus (南方古猿). It was found near Johannesburg in 1947 and, based on evidence from its surroundings, was thought to be between 2. 1 and 2. 6 million years old. This puzzled scientists, because although Mrs Ples looks like a possible early ancestor of early humans, the first true humans had already evolved by the time she apparently lived. For this reason, scientists had decided that Australopithecus afarensis, a similar species from East Africa that lived about 3.5 million years ago, was our most likely ancestor instead.

To get a more accurate age for Mrs Ples, a team led by Professor Darryl Granger of Purdue University in Indiana, US, used a new method to date the sandy rocks where the skull lay. They measured the amount of certain chemicals in rocks, which form at a steady rate when they are exposed to cosmic rays (宇宙射线) on Earth’s surface. Once rocks are buried, these chemicals stop forming and slowly disappear;the surviving amount reveals how much time has passed since the rock (or bones) were on the surface.

The new study shows that Mrs Ples and other australopithecine bones nearby are between 3.4 and 3.7 million years old. This means they lived at the same time as their East African relatives, so that either group could have given rise to modern humans. However, team member Dr Laurent Bruxelles pointed out that over millions of years, at only 2,500 miles away, these groups had plenty of time to travel and to breed with each other. In other words, the groups could quite easily have met, had children together and both been part of the history of modern humans.

5 . A national park is an area set aside by a government for the preservation of the natural environment. The national parks in the United States and Canada center on the protection of both land and wildlife.     1     And those in Africa primarily protect animals.

It is widely thought that the idea of a park or nature reserve under state ownership started in the United States in 1870.     2     Yosemite, Sequoia, and General Grant National Parks were established in the United States in 1890. And the U. S. National Park Service (NPS)was created in 1916 to manage the parks.     3     In addition to national parks, the system included national preserves, seashores, historic parks and sites and so on.

Partly following the American example, movements supporting national parks sprang up in many other countries.     4     . And Canada set up its first three national parks in the mid-1880s. The establishment of modern national parks and nature reserves gained momentum (动力)only after World War I or, in some cases, after World War II in Europe. Great Britain established the administrative machinery for both national parks and nature reserves in 1949.     5    

But interest in parks came later in Asia and Latin America than it did in the Anglo-American countries and Europe.

6 . About 5,300 years ago, people from the grasslands of modern-day Russia and Ukraine expanded rapidly across Eurasia. Within a few centuries these “Yamnaya” left a lasting genetic mark on populations from central Europe to the Caspian Sea. Today, archaeologists call them “eastern cowboys” for their livestock herding (畜牧) and highly mobile lifestyle.

But one part of the classic cowboy picture was missing: horseback riding. Although cattle bones and solid carriages have been found in Yamnaya sites, horse bones are hard to find, and most archaeologists assumed people did not start to ride horses until at least 1,000 years later.

In a new study published in Science Advances, researchers say they’ve found the earliest evidence of horseback riding not in the bones of ancient horses, but in their Yamnaya riders. “Everyone has focused on horse remains to get an idea of early horse riding,” says co-author and University of Helsinki archaeologist Volker Heyd. “Our approach was to look at humans.”

The researchers looked at more than 150 bones unearthed in Romania, Hungary, and Bulgaria — the western frontier of Yamnaya expansion. The Yamnaya were well-fed, healthy, and tall; the chemical composition of their bones showed protein rich diets consistent with herding cattle and sheep. But the bones showed signs of distinctive wear and tear. They also showed thick spots on the leg bone consistent with lots of time spent on the horse back. Healed injuries matched the kinds of damage a kicking horse might cause, or what sports medicine doctors today see in riders thrown from their horses.

“In terms of trying to identify people riding horses, I think they’ve done the best job possible bioarchaeologically,” says bioarchaeologist Jane Buikstra. “That doesn’t mean it’s perfect, or convincing, ultimately.”

More samples — including horse bones with signs of riding, such as bit marks or back bone damage from the weight of a rider — would help make the case, says CU bioarchaeologist Lauren Hosek. What the group has found “is really interesting”, she says. “But there’s a lot more work to be done when the risks of drawing the final conclusion are as high as the earliest horse riding.”

8 . Why You Should Visit the Four Imperial Cities of Morocco

Fez

Fez is arguably the most storied of the four imperial (皇家的) cities. It was founded in the late 9th century and it served as a capital seven times, most recently in 1912. Thanks to its long run as a capital in different eras, the city is home to numerous historical museums and important monuments. Visit Fez to learn more about Morocco’s history, check out its unique architecture, and experience its energetic culture.

Marrakesh

Marrakesh was founded in the late 11th century and it served as the capital for four different dynasties. It is now considered the No.1 tourist destination in Morocco, with visitors from all over the world coming to see its luxury imperial palaces, splendid gardens, and ancient markets and try some of the best food in this part of the world.

Meknes

Meknes was Morocco’s capital between 1672 and 1727. Even this short period was enough to leave a lasting mark on the city in the form of old imperial palaces, castles, and gates. The city also has plenty of other fascinating things to check out, like the Museum of Moroccan Art, several old mosques (清真寺), old markets, and nearby Roman   Ruins.

Rabat

Rabat is the current capital of the country. It was founded by the Almohad dynasty in the 12th century with this purpose, although it took until 1955 for the city to claim this status officially. There are numerous historical tourist attractions to check out in Rabat, including the Mausoleum of Mohamed V, the unfinished Hassan Tower, and the Chellah Roman Ruins. Being situated at the seaside also means that you will be able to have other activities besides sightseeing.

9 . Imagine this: You’re digging a well, and instead of hitting water, you unearth a headless human body made of pottery. This actually happened to farmers in Shanxi province in central China in 1974. Local archaeologists heard of the find and biked over to investigate. They realized that the figure had come from a tomb built over 2,000 years ago for China’s first emperor, Qin Shihuang. Archaeologists finally discovered three separate pits (穴) filled with 8,000 life-sized statues, all made from terracotta — a type of fired clay.

About a mile away from these pits, there’s a large mound (山丘). Archaeologists know that this is the main part of Qin Shihuang’s tomb, but they have never looked inside. They have left it alone out of respect for the first emperor and to protect the tomb as it is.

“Many people wish to see the treasures and mysteries inside, but we cannot,” says Xiuzhen Li, an archaeologist. Opening the tomb could damage its contents. Someday, Li hopes, we’ll have technology that will let us see inside the main part of the tomb without opening and disturbing it.

“Probably in the near future we’ll have some new technology that can see inside like an x-ray,” she says. Scientists are working on techniques that make it possible to see underground. Another idea is that a tiny robot could enter through a small hole and capture videos of what it sees. Even if this robotic exploration is done very carefully, however, it would still damage the tomb. For now, the Chinese government prefers to wait to do anything until they have even better technology.

10 . Sometimes shipwrecks（沉船）contain sunken treasure, loads of gold or jewelry. Other shipwrecks are themselves the treasure—the stories of their ill-fated voyages creating a legend that makes them sparkle far more than any gold or precious stones.

The wreck of HMS Endurance, which has finally been located deep beneath the icy seas of Antarctica after being lost 107 years ago, was arguably the most valuable shipwreck ever sought. That’s because its discovery adds another thrilling new chapter to an already fascinating tale of perseverance and survival that has echoed down the decades and still inspires today.

Incredibly well preserved at a depth of almost two miles, the ship is little changed from the day in November 1914 when it finally sank beneath the ice. Endurance became embedded in ice while crossing Antarctica’s Weddell Sea. The video shot by underwater search vehicles shows painted timbers, an undamaged guardrail（护栏）and the name “Endurance” written above the five-pointed symbol of a polar star.

“I tell you, you would have to be made of stone not to feel a bit soft at the sight of that star and the name above,” Mensun Bound, the mission’s marine archaeologist, told the BBC. “You can see a porthole（舷窗）that is in Shackleton’s cabin. At that moment, you really do feel the breath of the great man upon the back of your neck.” Shackleton’s leadership was crucial to getting his men out alive. The reason why Shackleton is still applauded as a great man becomes obvious when you consider what he achieved in the face of disasters and hardships during his 1914-16 expedition. The practicality and humanity he showed in the face of severe situations was arguably praised.