question: When was the man that Dewar benzene is named for born?
answer: 20 September 1842
context: Title: Dewar benzene
  Passage: Dewar benzene or bicyclo[2.2.0]hexa-2,5-diene is a bicyclic isomer of benzene with the molecular formula CH.  The compound is named after James Dewar who included this structure in a list of possible CH structures in 1867.  However, he did not propose it as the structure of benzene, and in fact he supported the correct structure previously proposed by August Kekulé in 1865.
  Title: Claude Choules
  Passage: Claude Stanley Choules ( ; 3 March 1901 – 5 May 2011) was an English-born military serviceman from Perth, Australia who at the time of this death was the oldest combat veteran of the First World War from England, having served with the Royal Navy from 1915 until 1926, after having emigrated to Australia he served with the Australian Royal Navy, from 1926 until 1956, as a Chief Petty Officer and was a naturalised Australian citizen.  He was the last surviving military witness to the scuttling of the German fleet in Scapa Flow in 1919.  He was also the last surviving veteran to have served in both world wars, at the time of his death, he was also the third-oldest verified military veteran in the world and the oldest known living man in Australia.  He was the seventh-oldest living man in the world.  Choules became the oldest man born in the United Kingdom following the death of Stanley Lucas on 21 June 2010.  Choules died in at the age of 110 years and 63 days.  He had been the oldest British-born man; following his death, that honour went to Reverend Reginald Dean.  In December 2011, the landing ship HMAS "Choules" was named after him, only the second Royal Australian Navy vessel named after a sailor.
  Title: James Dewar
  Passage: Sir James Dewar FRS FRSE (20 September 1842 – 27 March 1923) was a Scottish chemist and physicist.  He is probably best known today for his invention of the vacuum flask, which he used in conjunction with extensive research into the liquefaction of gases.  He was also particularly interested in atomic and molecular spectroscopy, working in these fields for more than 25 years.
citations: James Dewar Dewar benzene