Ken liberated slaves politically, so he was assassinated by racists. There were no guards in the presidential box when the murder happened. 1675, only a few people heard the gunshots. Even Mrs Lincoln, who was sitting next to her, and several people who accompanied her to the theatre were not frightened by the gunshots. Because the murderer Booth chose the climax of the play to shoot, it is difficult to hear the laughter and gunshots of the actors mixed together.

Then the box was in chaos. Booth jumped from the box to the stage, turned to the audience and shouted, "This is what happens to all tyrants." This is a famous saying in Virginia.

Politically, it is caused by the opposition between North and South. Everyone knows the political differences between the two sides, but there is a very secret history behind them. North and South met nominally, but during the war, everyone abided by a rule, that is, not to assassinate each other's leaders. But this rule was broken by Lincoln himself. I can't remember the specific things, but Lincoln did start the practice of assassinating each other between the north and the south.

Later, the south assassinated Lincoln more than once, at least twice before: once Lincoln was intercepted while traveling alone, and once he planned to blow up the White House, but both failed.

1900, McCartney was stabbed to death [small message].

Kennedy, the 35th President of the United States

It has been 40 years since the assassination of former US President John F. Kennedy, but the truth of this shocking murder is still foggy. According to some surveys, there have been at least 36 different versions of the inside story about Kennedy's assassination in the past 40 years, but so far, none of them are really convincing and none of them have been proved to be true. However, according to The New York Times, the biggest mystery in this murder case-whether Lee Harvey Oswald had an accomplice-will be solved within one year.

It is reported that scientists at Lawrence Berkeley National Laboratory are using a digital scanning instrument to reproduce the only recording of Kennedy's assassination. This recording was made through a microphone on a police motorcycle at the scene of the assassination. For decades, scientists have repeatedly studied this live recording, but because the recording tape is very unclear, it is difficult to distinguish between gunfire and noise, and no final conclusion has been reached.

The official investigation report "Warren Report" published by the US government on 1964 confirmed that Oswald was the only murderer when Kennedy was assassinated. He shot Kennedy three times at the Texas Book Building. However, after 15, the investigation committee of the US House of Representatives re-investigated the case and concluded that the assassin fired four shots at Kennedy, three of which came from the book building and the other from another place. This conclusion further increases people's suspicion that Oswald committed the crime alone.

1979, the U.S. congress investigated the live recording of police recorded telephone calls in that year, and was surprised to find that there were four gunshots at that time! After the experiment at the scene of Kennedy's assassination, there is evidence that the first, second and fourth shots came from the book storage room of the library, while the third shot came from the nearby hillside.

But three years later, after acoustic analysis, the National Science Association of the United States concluded that the so-called "third shot" was only electrostatic noise or other noise. Since then, no such investigation has been conducted.

The tape has been damaged by countless plays. When 1990 became the property of the National Archives of the United States, the technicians suggested stopping analyzing and recording data by physical means. This brings a challenge to solve the mystery of Kennedy's assassination, but with the development of new technology, this problem will be solved.

According to Waffen, archivist of the National Archives of the United States, digital analysis technology can not only capture sound, but also remove some noise, so as to better identify gunshots. Scientists have studied these sounds for nearly 30 years, but there have been differences. Today's technology will help people solve this mystery.

In June this year, the Advisory Board of the National Archives of the United States held a meeting, believing that the National Archives has the responsibility to help restore the historical truth, and therefore agreed to let Hubble and Dief of Berkeley Lab do this work. They restored the sound of Edison's phonograph with digital optical fiber.

Two scientists will scan the grooves of the tape and make digital images of sound patterns. Once this work is completed, scientists will get a very clear recording, which will also help to find out how many shots the murderer fired. It is expected that this historical mystery that puzzles government officials, detectives and historians will be solved as soon as possible.