Archaeologists in China have recently found the world’s oldest known coin manufacturing(制造)site. The site     1     (use) to make metal money around 2,600 years ago. It is located in the ancient city of Guanzhuang, in     2     is now China’s Henan Province.

Using radiocarbon(放射性碳)dating, the researchers came to the     3     (conclude) that the workshop began minting(铸造)operations between 640 BC and 550 BC. The discovery of the coin mint is     4     (true) exciting as it shows the existence of a very old coin workshop.

The coins     5     (make) at the workshop are “spade money”. They replaced     6     (shell) during the Spring and Autumn Period (about 770 to 476 BC). The workshop was close to the city’s administrative center,     7     suggests that it may have begun minting coins on government orders.

The new study adds fuel     8     a long-standing debate about the origins of currency. Some scholars argue that money     9     (begin) as a way to help trade between merchants and customers. Others say governments created it     10     (allow) for the collection of taxes and debts.

3 . Scientists found what could be the oldest evidence of cooking at the edge of the ancient Lake Hula in Israel at the Gesher Benot Ya’aqov, according to a newly-published paper. The remains, especially fish teeth, were discovered near places where scientists also found signs of fire. Tests showed the teeth had been exposed to temperatures that were hot, but not super-hot. This suggested the fish were cooked slowly over a low heat, rather than being put right onto a fire.

With all the evidence together, scientists concluded that these ancient humans had used fire for cooking some 780,000 years ago. That is much earlier than the next oldest evidence for cooking, about 170,000 years ago, which showed Stone Age humans ate burnt roots in South Africa.

Scientists believe cooking started long before this, though physical evidence has been hard to come by —considering the importance of using fire to cook. Cooked food makes it easier for the body to digest and get more nutrients. When early humans figured out how to cook, they were able to get more energy, which they could use to fuel bigger brains. Based on how human ancestors’ bodies developed, scientists guess that cooking skills would have had to appear nearly 2 million years ago.

Those first cooked meals were a far cry from today’s dinners. And at that time, humans started eating not just for fuel, but for their community. In a 2010 paper, scientists described the earliest evidence of a feast(盛宴), which was a specially prepared meal that brought people together for an event in a cave. This “first feast” came at an important turning point in human history, right as hunter-gatherers were starting to settle into more permanent living situations. Gathering for special meals may have been a way to build community and reduce tensions now that people lived closer to each other. Scientists believe ancient feasts served a lot of the same social uses that modern gatherings serve: People exchange information, make connections, or try to improve their position.

5 . While most people don’t think much about garbage, trash (垃圾) is beloved by archaeologist (考古学家). A favorite site for study is a midden (贝丘), an old trash or garbage heap (堆). A midden might contain damaged stone or metal items, which tell us about the weapons and tools people used. Softer materials such as wood, cloth, leather, and baskets are sometimes preserved. They may tell us what people wore, how they carried things, or the kind of toys used by children. Historic household trash heaps often contain broken pottery pieces and even traces of the food they once held.

Most people no longer keep a trash heap by the kitchen door. Instead, garbage is hauled off to landfills (垃圾填埋池). These landfills can still attract archaeologists. The Garbage Project collected information from landfills from 1987 to 1995. Student archaeologists measured tons of garbage from 15 landfills across the United States and Canada. This garbology, the study of garbage, research led to a better understanding of how people have changed what they consume during this period of time. The findings also led to a better awareness of how quickly various items rot. This helped with city planning for garbage disposal and recycling efforts.

Some found objects that may clearly be of archaeological interest, such as arrowheads and spear points. It is typically against the law to collect these on public lands, so they should be left in place. If you take a photo and note the location, you can notify the state archaeologist or the government branch that is in charge of the land, such as the National Park Service or the Bureau of Land Management.

Everyone is responsible for protecting archaeological resources, which is a concept known as “archaeological stewardship.” Sometimes this even means protecting old garbage.

7 . On July 31, 1697, a French lawyer named Jacques Sennacques wrote a message to remind a cousin in the Netherlands to send him a relative’s death certificate. To prevent others from reading the message, the note was carefully folded, or “letter locked.” The technique was used before the invention of envelopes. However, for reasons unknown, the note never reached the recipient and was instead stored in a postmaster’s trunk, where it remained undetected for centuries. Now, a team of international researchers has deciphered (破译) the contents of the over 300-year-old sealed letter — without opening it!

The chain of events leading to this technology began in 2015 when MIT expert Jana Dambrogio got a call from Daniel Starza Smith, a researcher at King’s College London. “He asked me, ‘What would you do if I told you there was a trunk with 600 unopened letters?’”

The trunk had once belonged to 17th-century postmaster Simon de Brienne. Historians believe the post office stored the undelivered letters. That’s because, in the 17th century, it was the recipient, not the sender, who bore the postage cost. When Brienne died in 1707, he donated the trunk of letters to an orphanage. Somehow, the trunk eventually made its way to the postal museum, where it lay until recently.

Since opening the letters would destroy them, Dambrogio and her team decided to develop technology to unseal them virtually. They began by using a high-resolution X-ray scanner to create a detailed three-dimensional image of a sealed letter. While the writing inside showed up very clearly, the numerous layers of folded paper pressed close together caused the words to overlap (重叠).

To solve the issue, the researchers created sophisticated algorithm (算法) capable of deciphering the writing in the cleverly folded letter, crease by crease. The virtual opening allowed the team to read the contents “while preserving letter locking evidence.” The algorithm took almost five years to perfect. Once perfected, they used it to open four locked letters and fully decode(解码) the one from Sennacques.

9 . In the late 1930s, a collection of 14 gold Roman coins, known as the Chapipi treasure, was also found in the same woodlands. The researchers believe that local people may have buried their coins to keep them safe during a period of intense political instability in the region. The most recent coin in the newly-discovered Grado collection dates to A.D. 430, which was after the Suebi — a group of Germanic people originally from modern-day Germany and the Czech Republic — pushed the Romans out of Spain in A.D. 409, according to El Pais.

Working on one of the most famous sites in the world, I’m delighted though tired and covered in dust. I have been digging all day as an archaeology student from England since I     1     (select). The Terracotta Warriors (兵马俑) were discovered in 1974. Some peasants were digging a well     2     they dug up the head of a clay warrior. Can you imagine their     3     (astonish)? Soon archaeologists from Beijing,     4     the whole world knows, dug up 6, 000 clay warriors here. The warriors vary in height according to their roles, with the     5     (tall) being the generals. Eventually Emperor Qin Shihuang’s Tomb was also found nearby. In 1976 another spot was discovered, this one     6     (contain) 1, 400 warriors. The firm belief that there existed life after death got around widely     7     the Ancient Chinese. It seemed that Emperor Qin Shihuang had had the soldiers     8     (make), which were buried near     9     (he) to guard his soul in the next life. Although it lay here hidden and forgotten for so long, the site is visited by tourists from every comer of     10     globe. How fortunate I am working here!