input: In 1776, the first engines were installed and working in commercial enterprises. These first engines were used to power pumps and produced only reciprocating motion to move the pump rods at the bottom of the shaft. The design was commercially successful, and for the next five years Watt was very busy installing more engines, mostly in Cornwall for pumping water out of mines.  These early engines were not manufactured by Boulton and Watt, but were made by others according to drawings made by Watt, who served in the role of consulting engineer. The erection of the engine and its shakedown was supervised by Watt, at first, and then by men in the firm's employ. These were large machines. The first, for example, had a cylinder with a diameter of some 50 inches and an overall height of about 24 feet, and required the construction of a dedicated building to house it. Boulton and Watt charged an annual payment, equal to one third of the value of the coal saved in comparison to a Newcomen engine performing the same work.  The field of application for the invention was greatly widened when Boulton urged Watt to convert the reciprocating motion of the piston to produce rotational power for grinding, weaving and milling. Although a crank seemed the obvious solution to the conversion Watt and Boulton were stymied by a patent for this, whose holder, James Pickard, and associates proposed to cross-license the external condenser. Watt adamantly opposed this and they circumvented the patent by their sun and planet gear in 1781.  Over the next six years, he made a number of other improvements and modifications to the steam engine. A double acting engine, in which the steam acted alternately on the two sides of the piston was one. He described methods for working the steam "expansively" (i.e., using steam at pressures well above atmospheric). A compound engine, which connected two or more engines was described. Two more patents were granted for these in 1781 and 1782. Numerous other improvements that made for easier manufacture and installation were continually implemented. One of these included the use of the steam indicator which produced an informative plot of the pressure in the cylinder against its volume, which he kept as a trade secret. Another important invention, one which Watt was most proud of, was the parallel motion which was essential in double-acting engines as it produced the straight line motion required for the cylinder rod and pump, from the connected rocking beam, whose end moves in a circular arc. This was patented in 1784. A throttle valve to control the power of the engine, and a centrifugal governor, patented in 1788, to keep it from "running away" were very important. These improvements taken together produced an engine which was up to five times as efficient in its use of fuel as the Newcomen engine.  Because of the danger of exploding boilers, which were in a very primitive stage of development, and the ongoing issues with leaks, Watt restricted his use of high pressure steam - all of his engines used steam at near atmospheric pressure.

Answer this question "What was one of the improvements?"
output: A double acting engine, in which the steam acted alternately on the two sides of the piston was one.

Question: Robert James Fischer (March 9, 1943 - January 17, 2008) was an American chess grandmaster and the eleventh World Chess Champion. Many consider him to be the greatest chess player of all time. Bobby Fischer showed great skill in chess from an early age; at 13, he won a brilliancy known as "The Game of the Century". At age 14, he became the US Chess Champion, and at 15, he became both the youngest grandmaster up to that time and the youngest candidate for the World Championship.

Sources implying that Paul Nemenyi, a Hungarian-Jewish mathematician and physicist and an expert in fluid and applied mechanics, was Fischer's biological father were first made public in a 2002 investigation by Peter Nicholas and Clea Benson of The Philadelphia Inquirer. Throughout the 1950s, the FBI investigated Regina and her circle for her alleged communist sympathies, as well as her previous life in Moscow.  FBI files identify Paul Nemenyi as Bobby Fischer's biological father, showing that Hans-Gerhardt Fischer never entered the United States, having been refused admission by US immigration officials due to his alleged Communist sympathies. Not only were Regina and Nemenyi reported to have had an affair in 1942, but Nemenyi made monthly child support payments to Regina and paid for Bobby's schooling until his own death in 1952. Nemenyi had lodged complaints with social workers, saying he was concerned about the way that Regina was raising Bobby, to the point that, on at least one occasion, Nemenyi broke down in tears. Later on Bobby told the Hungarian chess player Zita Rajcsanyi that Paul Nemenyi would sometimes show up at the family's Brooklyn apartment and take him on outings.  After Paul Nemenyi died in 1952, Regina Fischer wrote a letter to Nemenyi's first son, Peter, asking if Paul had left money for Bobby in his will:  Bobby was sick 2 days with fever and sore throat and of course a doctor or medicine was out of the question. I don't think Paul would have wanted to leave Bobby this way and would ask you most urgently to let me know if Paul left anything for Bobby.  On one occasion, Regina told a social worker that the last time she had ever seen Hans-Gerhardt Fischer was in 1939, four years before Bobby was born. On another occasion, she told the same social worker she had traveled to Mexico to see Hans-Gerhardt in June 1942 and that Bobby was conceived during that meeting. According to Bobby Fischer's brother-in-law, Russell Targ (who was married to Joan), Regina concealed the fact that Nemenyi was Bobby's father because she wanted to avoid the stigma of an out-of-wedlock birth.

Using a quote from the above article, answer the following question: Did Paul have any other children?
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Answer:
After Paul Nemenyi died in 1952, Regina Fischer wrote a letter to Nemenyi's first son, Peter, asking if Paul had left money for Bobby in his will: