On This Date In History

On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the elements radium and polonium in their research of pitchblende. One year after isolating radium, they would share the 1903 Nobel Prize in physics with French scientist A. Henri Becquerel for their groundbreaking investigations of radioactivity.
Marie Curie was born Marie Sklodowska in Warsaw, Poland, in 1867. The daughter of a physics teacher, she was a gifted student and in 1891 went to study at the Sorbonne in Paris. With highest honors, she received a degree in physical sciences in 1893 and in mathematics in 1894. That year she met Pierre Curie, a noted French physicist and chemist who had done important work in magnetism. Marie and Pierre married in 1895, marking the beginning of a scientific partnership that would achieve world renown.
Looking for a subject for her doctoral thesis, Marie Curie began studying uranium, which was at the heart of Becquerel’s discovery of radioactivity in 1896. The term radioactivity, which describes the phenomenon of radiation caused by atomic decay, was in fact coined by Marie Curie. In her husband’s laboratory, she studied the mineral pitchblende, of which uranium is the primary element, and reported the probable existence of one or more other radioactive elements in the mineral. Pierre Curie joined her in her research, and in 1898 they discovered polonium, named after Marie’s native Poland, and radium.
While Pierre investigated the physical properties of the new elements, Marie worked to chemically isolate radium from pitchblende. Unlike uranium and polonium, radium does not occur freely in nature, and Marie and her assistant Andre Debierne laboriously refined several tons of pitchblende in order to isolate one-tenth gram of pure radium chloride in 1902. On the results of this research, she was awarded her doctorate of science in June 1903 and later in the year shared the Nobel Prize in physics with her husband and Becquerel. She was the first woman to win a Nobel Prize.
Pierre Curie was appointed to the chair of physics at the Sorbonne in 1904, and Marie continued her efforts to isolate pure, non-chloride radium. On April 19, 1906, Pierre Curie was killed in an accident in the Paris streets. Although devastated, Marie Curie vowed to continue her work and in May 1906 was appointed to her husband’s seat at the Sorbonne, thus becoming the university’s first female professor. In 1910, with Debierne, she finally succeeded in isolating pure, metallic radium. For this achievement, she was the sole recipient of the 1911 Nobel Prize in chemistry, making her the first person to win a second Nobel Prize.
She became interested in the medical applications of radioactive substances, working on radiology during World War I and the potential of radium as a cancer therapy. Beginning in 1918, the Radium Institute at the University of Paris began to operate under Curie’s direction and from its inception was a major center for chemistry and nuclear physics. In 1921, she visited the United States, and President Warren G. Harding presented her with a gram of radium.
Curie’s daughter, Irene Curie, was also a physical chemist and, with her husband, Frederic Joliot, was awarded the 1935 Nobel Prize in chemistry for the discovery of artificial radioactivity. Marie Curie died in 1934 from leukemia caused by four decades of exposure to radioactive substances.

 

 

 

On April 20, 1980, the Castro regime announces that all Cubans wishing to emigrate to the U.S. are free to board boats at the port of Mariel west of Havana, launching the Mariel Boatlift. The first of 125,000 Cuban refugees from Mariel reached Florida the next day.
The boatlift was precipitated by housing and job shortages caused by the ailing Cuban economy, leading to simmering internal tensions on the island. On April 1, Hector Sanyustiz and four others drove a bus through a fence at the Peruvian embassy and were granted political asylum. Cuban guards on the street opened fire. One guard was killed in the crossfire.
The Cuban government demanded the five be returned for trial in the dead guard’s death. But when the Peruvian government refused, Castro withdrew his guards from the embassy on Good Friday, April 4. By Easter Sunday, April 6, some 10,000 Cubans crowded into the lushly landscaped gardens at the embassy requesting asylum. Other embassies, including those of Spain and Costa Rica, agreed to take a small number of people. But suddenly, two weeks later, Castro proclaimed that the port of Mariel would be opened to anyone wishing to leave, as long as they had someone to pick them up. Cuban exiles in the United States rushed to hire boats in Miami and Key West and rescue their relatives.
In all, 125,000 Cubans fled to U.S. shores in about 1,700 boats, creating large waves of people that overwhelmed the U.S. Coast guard. Cuban guards had packed boat after boat, without considering safety, making some of the overcrowded boats barely seaworthy. Twenty-seven migrants died, including 14 on an overloaded boat that capsized on May 17.
The boatlift also began to have negative political implications for U.S. President Jimmy Carter. When it was discovered that a number of the exiles had been released from Cuban jails and mental health facilities, many were placed in refugee camps while others were held in federal prisons to undergo deportation hearings. Of the 125,000 “Marielitos,” as the refugees came to be known, who landed in Florida, more than 1,700 were jailed and another 587 were detained until they could find sponsors.
The exodus was finally ended by mutual agreement between the U.S. and Cuban governments in October 1980.

 

 

May 1980: A Cuban refugee girl cries as she lands in Key West Naval Air Station after being rescued at sea by the U.S. Marines. Most of her family members died along with at least 14 others who drowned when the boat they were in from Mariel sank in high winds after being forced to leave the harbor by Cuban authorities. MIAMI HERALD STAFF

May 1980: A line of Cuban refugees wait on the Key West docks to clear immigration after arriving from Mariel, Cuba. MIAMI HERALD STAFF

May 1980: A line of Mariel refugees are checked by a U.S. Marine at the Key West docks after it was learned that Castro had released prisoners from his jails and put them on boats in Mariel harbor to be sent to the U.S. in the exodus of the Mariel Boatlift. MIAMI HERALD STAFF

 
May 1980: Cuban refugees from Mariel harbor crammed into an airplane hanger after being flown from Key West, where over 100, 000 arrived by boat fleeing Cuba. MIAMI HERALD STAFF