In 1926, Chinese archaeologists discovered two early human tooth fossils dating back about 690,000 years on Dragon Bone Hill in Zhoukoudian, Yanjing. This discovery caused a sensation in the Chinese archaeological community at the time. Then in the second year, in 1927, a large-scale excavation operation was launched on Dragon Bone Hill.

In 1929, a relatively complete skull fossil of a Peking Man was discovered on Dragon Bone Hill. The subsequent excavation work continued intermittently until 1936. After seven years of excavation, a total of five relatively complete skull fossils of Peking Man and about two hundred other bone fossils belonging to various species of Peking Man were unearthed.

The discovery of the Peking Man skull fossil is a major event in the history of paleoanthropology. So far, no other ancient human site has such a large number of ancient human, ancient culture, ancient animal fossils and other materials as the Zhoukoudian Peking Man Site. The Peking Man fossil has become a rare treasure that has attracted the attention of the world's scientific community. Although the "Peking Man" is not the earliest human, as a representative of the intermediate link from apes to humans, it is called "the most meaningful and moving discovery in the entire history of ancient humans". Therefore, the preciousness of the Peking Man skull fossil can be imagined.

It is precisely because of this that the Peking Man skull fossils have attracted the covetousness of all parties. At that time, no matter which country it was, they wanted to take these five precious skull fossils back to their own country. Not to mention the Japanese who had already started the war of aggression against China at that time, they tried every means to get these five precious skull fossils.

But the Chinese archaeologists at that time were not fools, and they naturally tried their best to protect the skull fossils. But unfortunately, under the conditions at that time, the Chinese people were simply unable to preserve such a precious skull fossil.

In desperation, Chinese archaeologists led by Professor Jia Lanpo, known as the "Father of Beijing Human Skull Fossils", were forced to hide the five precious skull fossils in the Union Hospital funded by the Americans. At that time, although the Japanese were domineering in China, they had not yet torn their relations with the United States, so the Japanese had no way to deal with the five precious skull fossils being placed in the Union Hospital.

However, as the relationship between the United States and Japan became increasingly tense, it was not very safe to keep these skull fossils in the Union Hospital. Therefore, after seeking the consent of Chiang Kai-shek, these five Beijing skull fossils were approved to be transported to the United States for preservation.

But man proposes, but calculations are not as good as expectations. Just as these five Beijing skull fossils were being transferred according to the transfer plan, an unexpected turn of events occurred.

At that time, the transfer plan was to be escorted by the U.S. Marines, take a special train from Peiping to Qinhuangdao to reach Qinhuangdao Port, and board a ship there. The ship was named "President Hudson" and was scheduled to arrive in Qinhuangdao on December 8, 1941.

But when the train arrived in Qinhuangdao on the morning of December 8, Japan's air raid on Pearl Harbor had already begun. Then, the Japanese troops stationed in the Shanhaiguan area of ​​Qinhuangdao suddenly attacked the US troops. The train and military personnel of the US Marine Corps, including the personnel of the Holmes Barracks in Qinhuangdao, became prisoners of the Japanese army in an instant. Of course, the supplies and luggage including the "Beijing Man's Skull Fossil" became the spoils of the Japanese army and disappeared from then on...

Until now, seventy-seven years have passed, and the whereabouts of the Peking Man skull fossils has become an unsolved mystery. Countless people around the world who want to find these five Peking Man skull fossils have been unable to find any trace of these five skull fossils. Even if China has mobilized the power of the country to search for them, there is still no way.

Since the liberation, the Chinese have never stopped searching for the Peking Man's skull fossil. There have been many reports about the Peking Man's skull fossil, but no matter whether the skull fossil was buried in Ritan Gong, or mounted on the "Awa Maru" shipwreck, or whether the fossil was actually in the hands of the United States or the Japanese, other clues were eventually proven to be invalid clues.

The Chinese have been searching for these five extremely precious skull fossils for 77 years, but there has been no news. Therefore, many people believe that these five skull fossils are likely to have been destroyed in the war.

This method was also agreed by many people. After all, these were just five skulls that were no different from skeletons. In that era, because of the evil deeds of the Japanese invaders, the thing that was least lacking in China was human skulls. Therefore, it was actually a very normal thing for these five Beijing skull fossils to be treated as ordinary skulls and then buried or destroyed.

After all, in that era, no matter whether it was the Chinese people or the Japanese soldiers, they could not tell the difference between these five Beijing skull fossils and real human skulls. Moreover, even if someone saw these five skull fossils, they would not be in the mood to tell them apart. Therefore, the theory that these five skull fossils were destroyed in the war was actually accepted by many people.

Even Yang Jing himself believed that the Beijing skull fossils had been destroyed in the war before he saw these four skull fossils.

Unexpectedly, he traveled back to forty years ago and found these four precious skull fossils in a corner of this secret base!

Yang Jing only felt his hands trembling a little.

In fact, in terms of real value and the meaning they represent, these four skull fossils cannot be compared with the imperial seal that was once discovered, but these four skull fossils came so suddenly that Yang Jing was a little bit unbelievable. If the answer given by the Holy Ring was not indeed "Beijing skull fossils", he really thought that these four skull fossils were counterfeit.

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