It happened in 1972, when Vietnamese soldiers and people fought bravely to protect Quang Tri Citadel.

For 81 days and nights, they faced bombs, fire, and hardships but never gave up.Their courage and sacrifice showed the strong spirit and love for the country.We will always remember and be proud of them.

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Albert Einstein was a German theoretical physicist, best known for his theory of general relativity and the famous equation E=mc2E=mc^2E=mc2. He was born in 1879 in Ulm, Germany, and passed away in 1955 in the United States. Einstein is considered one of the greatest scientists of all time, with revolutionary contributions to modern physics. In 1921, he was awarded the Nobel Prize in Physics for his explanation of the photoelectric effect. Beyond science, Einstein was also known for his profound views on peace, human rights, and philosophy of life.

He's also famous for his well-known equation of E=mc². In the equation, 'c' is the speed of light which is constant and seen as the fastest speed possible, 'E' is energy and 'm' is mass. The equation explains how time and distance may change due to the 'relative' or different speed of the object and the observer.

In 1905, Einstein had what is known as his "miracle year," publishing several groundbreaking papers, including his special theory of relativity and the famous equation E = mc², which showed that mass and energy are interchangeable. In 1915, he introduced the general theory of relativity, which redefined gravity as the bending of space and time by mass. This theory was confirmed during a 1919 solar eclipse, making Einstein world-famous.

He was awarded the Nobel Prize in Physics in 1921, not for relativity, but for his explanation of the photoelectric effect, which was key to the development of quantum physics. As a Jew, Einstein left Germany in the 1930s to escape the rise of the Nazis and settled in the United States, where he worked at the Institute for Advanced Study in Princeton.

Although a lifelong pacifist, Einstein warned President Roosevelt in 1939 about the threat of Nazi atomic weapons, which helped prompt the creation of the Manhattan Project. In his later years, he remained active in speaking out for peace, civil rights, and international cooperation.

Einstein died in 1955, leaving behind a scientific legacy that forever changed the way we understand the universe. He remains one of the most influential and iconic figures in science.

Marie Curie was a pioneering scientist born in Poland in 1867. She moved to France to study physics and mathematics, becoming one of the first women to attend the University of Paris. Curie made groundbreaking discoveries in the field of radioactivity, a term she helped create. Alongside her husband Pierre Curie, she discovered two new elements: polonium and radium. Her work led to major advances in science and medicine, including the development of X-ray machines and cancer treatments. She became the first woman to win a Nobel Prize and the first person ever to win two Nobel Prizes in different sciences—Physics in 1903 and Chemistry in 1911. Sadly, she died in 1934 from a disease caused by long-term exposure to radiation, which was not yet known to be harmful. Marie Curie is remembered not only for her scientific achievements but also for breaking the limits that people put up for women in the 19s century. Her life teaches us about perseverance, courage, and the power of curiosity.

Their first U.S. patent did not claim invention of a flying machine, but rather a system of aerodynamic control that manipulated a flying machine's surfaces. From the beginning of their aeronautical work, Wilbur and Orville focused on developing a reliable method of pilot control as the key to solving "the flying problem". Suddenly, Wilbur and Orville were unhappy with the ttention and they were worried that other people might try to steal their airplane designs.  They secretly tested their airplane and took their own photographs of the test flights.  Because of this secrecy, many newspapers did not believe the Wright brothers’ success.  Finally, the Wright brothers demonstrated their flying machine both in France and for the United States’ Army and they became famous around the world.

Khanh Chi & An Phuc

The First Moon Landing was an important event that helps human exchange their knowledge about space. On July 16, 1969, the Apollo 11 mission left the Earth and started to go to the Moon. This mission carried Neil Amstrong-the commander, Buzz Aldrin-the lunar module pilot and Micheal Collins-the command module pilot of Columbia. They took pictures of the moon and collected 21.5kg of lunar samples bring back to Earth. This discovery promoted human to explore more about the universe.

Later, Michael became a solo artist and released many successful albums. His most famous album, Thriller, came out in 1982 and became the best-selling album of all time. It included hit songs like “Billie Jean,” “Beat It,” and “Thriller.” Michael also made exciting music videos that changed how people saw pop music.

Michael Jackson was known for his amazing dance moves, especially the moonwalk. He had a unique style, wearing sparkly gloves, fancy jackets, and black hats. Many people around the world copied his fashion and dance.

Besides music, Michael cared about helping others. He gave money to charities and sang songs about peace, love, and the environment. Songs like “Heal the World” and “Earth Song” showed his hope for a better world.

Michael Jackson died on June 25, 2009, but his music and influence are still strong today. He inspired many artists and fans all over the world. People still listen to his songs, watch his videos, and remember him as the King of Pop.

Vincent van Gogh was a Dutch painter born in 1853 in the Netherlands. Before becoming an artist, he worked as an art dealer, teacher, and even tried to be a pastor, but he struggled to find his true path. At the age of 27, he devoted himself to art and created many famous paintings like Starry Night and Sunflowers. Although his bright and emotional style is loved today, Van Gogh faced many difficulties, including mental illness and poverty. He died in 1890 at the age of 37, leaving behind a legacy that changed the world of art forever. Van Gogh brought many amazing arts to the life, he taught us to never give up on our passion, even when no one else believes.