Question: Isaac Asimov (; c. January 2, 1920 - April 6, 1992) was an American writer and professor of biochemistry at Boston University. He was known for his works of science fiction and popular science. Asimov was a prolific writer who wrote or edited more than 500 books and an estimated 90,000 letters and postcards. His books have been published in 9 of the 10 major categories of the Dewey Decimal Classification.

Asimov was born on an unknown day between October 4, 1919 and January 2, 1920, inclusive. Asimov himself celebrated it on January 2. Asimov's parents were Anna Rachel (nee Berman) and Judah Asimov, a family of Jewish millers. He was named Isaac after his mother's father, Isaac Berman. When he was born, his family lived in Petrovichi near Klimovichi, which was then Gomel Governorate in the Russian Soviet Federative Socialist Republic (now Smolensk Oblast, Russia). Asimov wrote of his father, "My father, for all his education as an Orthodox Jew, was not Orthodox in his heart", noting that "he didn't recite the myriad prayers prescribed for every action, and he never made any attempt to teach them to me". In 1921, Asimov and 16 other children in Petrovichi caught double pneumonia. Only Asimov survived. He later had two younger siblings: a sister, Marcia (born Manya, June 17, 1922 - April 2, 2011), and a brother, Stanley (July 25, 1929 - August 16, 1995), who was vice-president of New York Newsday. His family emigrated to the United States when he was three years old. Since his parents always spoke Yiddish and English with him, he never learned Russian, but he remained fluent in Yiddish as well as English. Growing up in Brooklyn, New York, Asimov taught himself to read at the age of five, and his mother got him into first grade a year early by claiming he was born on September 7, 1919. In third grade he learned about the "error" and insisted on an official correction of the date to January 2. After becoming established in the U.S., his parents owned a succession of candy stores, in which everyone in the family was expected to work. The candy stores sold newspapers and magazines, a fact that Asimov credited as a major influence in his lifelong love of the written word, as it presented him with an unending supply of new reading material as a child that he could not have otherwise afforded. He became a naturalized U.S. citizen in 1928 at the age of eight.

Using a quote from the above article, answer the following question: What day was he born on
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Answer: an unknown day

Question: Salvador Domingo Felipe Jacinto Dali i Domenech, Marquis of Dali de Pubol (11 May 1904 - 23 January 1989), known professionally as Salvador Dali ( Catalan: [s@lb@'do d@'li]; Spanish: [salba'dor da'li]), was a prominent Spanish surrealist born in Figueres, Catalonia, Spain. Dali was a skilled draftsman, best known for the striking and bizarre images in his surrealist work. His painterly skills are often attributed to the influence of Renaissance masters.

Salvador Domingo Felipe Jacinto Dali i Domenech was born on 11 May 1904, at 8:45 am GMT, on the first floor of Carrer Monturiol, 20 (presently 6), in the town of Figueres, in the Emporda region, close to the French border in Catalonia, Spain. In the summer of 1912, the family moved to the top floor of Carrer Monturiol 24 (presently 10). Dali's older brother, who had also been named Salvador (born 12 October 1901), had died of gastroenteritis nine months earlier, on 1 August 1903. His father, Salvador Dali i Cusi, was a middle-class lawyer and notary whose strict disciplinary approach was tempered by his wife, Felipa Domenech Ferres, who encouraged her son's artistic endeavors. When he was five, Dali was taken to his brother's grave and told by his parents that he was his brother's reincarnation, a concept which he came to believe. Of his brother, Dali said, "[we] resembled each other like two drops of water, but we had different reflections." He "was probably a first version of myself but conceived too much in the absolute." Images of his long-dead brother would reappear embedded in his later works, including Portrait of My Dead Brother (1963). Dali also had a sister, Anna Maria, who was three years younger. In 1949, she published a book about her brother, Dali as Seen by His Sister. His childhood friends included future FC Barcelona footballers Sagibarba and Josep Samitier. During holidays at the Catalan resort of Cadaques, the trio played football (soccer) together. Dali attended drawing school. In 1916, he also discovered modern painting on a summer vacation trip to Cadaques with the family of Ramon Pichot, a local artist who made regular trips to Paris. The next year, Dali's father organized an exhibition of his charcoal drawings in their family home. He had his first public exhibition at the Municipal Theatre in Figueres in 1919, a site he would return to decades later. In February 1921, Dali's mother died of breast cancer. Dali was 16 years old; he later said his mother's death "was the greatest blow I had experienced in my life. I worshipped her... I could not resign myself to the loss of a being on whom I counted to make invisible the unavoidable blemishes of my soul." After her death, Dali's father married his deceased wife's sister. Dali did not resent this marriage, because he had a great love and respect for his aunt.

Using a quote from the above article, answer the following question: How was Dali affected by his mother's death?
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Answer:
he later said his mother's death "was the greatest blow I had experienced in my life.