Question:
Georg Ferdinand Ludwig Philipp Cantor ( KAN-tor; German: ['geoRk 'feRdinant 'lu:tvIc 'fIlIp 'kantoR]; March 3 [O.S. February 19] 1845 - January 6, 1918) was a German mathematician. He invented set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers.
After Cantor's 1884 hospitalization, there is no record that he was in any sanatorium again until 1899. Soon after that second hospitalization, Cantor's youngest son Rudolph died suddenly on December 16 (Cantor was delivering a lecture on his views on Baconian theory and William Shakespeare), and this tragedy drained Cantor of much of his passion for mathematics. Cantor was again hospitalized in 1903. One year later, he was outraged and agitated by a paper presented by Julius Konig at the Third International Congress of Mathematicians. The paper attempted to prove that the basic tenets of transfinite set theory were false. Since the paper had been read in front of his daughters and colleagues, Cantor perceived himself as having been publicly humiliated. Although Ernst Zermelo demonstrated less than a day later that Konig's proof had failed, Cantor remained shaken, and momentarily questioning God. Cantor suffered from chronic depression for the rest of his life, for which he was excused from teaching on several occasions and repeatedly confined in various sanatoria. The events of 1904 preceded a series of hospitalizations at intervals of two or three years. He did not abandon mathematics completely, however, lecturing on the paradoxes of set theory (Burali-Forti paradox, Cantor's paradox, and Russell's paradox) to a meeting of the Deutsche Mathematiker-Vereinigung in 1903, and attending the International Congress of Mathematicians at Heidelberg in 1904.  In 1911, Cantor was one of the distinguished foreign scholars invited to attend the 500th anniversary of the founding of the University of St. Andrews in Scotland. Cantor attended, hoping to meet Bertrand Russell, whose newly published Principia Mathematica repeatedly cited Cantor's work, but this did not come about. The following year, St. Andrews awarded Cantor an honorary doctorate, but illness precluded his receiving the degree in person.  Cantor retired in 1913, living in poverty and suffering from malnourishment during World War I. The public celebration of his 70th birthday was canceled because of the war. In June 1917, he entered a sanatorium for the last time and continually wrote to his wife asking to be allowed to go home. Georg Cantor had a fatal heart attack on January 6, 1918, in the sanatorium where he had spent the last year of his life.
Answer this question using a quote from the text above:

what did he do in his later years

Answer:
In 1911, Cantor was one of the distinguished foreign scholars invited to attend the 500th anniversary of the founding of the University of St. Andrews in Scotland.

Answer the question at the end by quoting:

Sam Benjamin Harris (born April 9, 1967) is an American author, philosopher, neuroscientist, blogger, and podcast host. He is a critic of religion and proponent of the liberty to criticize religion. He is concerned with matters that touch on spirituality, morality, neuroscience, free will, and terrorism. He is described as one of the "Four Horsemen of atheism", with Richard Dawkins, Christopher Hitchens and Daniel Dennett.
Harris considers Islam to be "especially belligerent and inimical to the norms of civil discourse," relative to other world religions. He asserts that the "dogmatic commitment to using violence to defend one's faith, both from within and without" to varying degrees, is a central Islamic doctrine that is found in few other religions to the same degree, and that "this difference has consequences in the real world."  In 2006, after the Jyllands-Posten Muhammad cartoons controversy, Harris wrote, "The idea that Islam is a 'peaceful religion hijacked by extremists' is a dangerous fantasy--and it is now a particularly dangerous fantasy for Muslims to indulge. It is not at all clear how we should proceed in our dialogue with the Muslim world, but deluding ourselves with euphemisms is not the answer. It now appears to be a truism in foreign policy circles that real reform in the Muslim world cannot be imposed from the outside. But it is important to recognize why this is so--it is so because the Muslim world is utterly deranged by its religious tribalism. In confronting the religious literalism and ignorance of the Muslim world, we must appreciate how terrifyingly isolated Muslims have become in intellectual terms." He states that his criticism of the religion is aimed not at Muslims as people, but at the doctrine of Islam.  Harris wrote a response to controversy over his criticism of Islam, which also aired on a debate hosted by The Huffington Post on whether critics of Islam are unfairly labeled as bigots:  Is it really true that the sins for which I hold Islam accountable are "committed at least to an equal extent by many other groups, especially [my] own"? ... The freedom to poke fun at Mormonism is guaranteed [not by the First Amendment but] by the fact that Mormons do not dispatch assassins to silence their critics or summon murderous hordes in response to satire. ... Can any reader of this page imagine the staging of a similar play [to The Book of Mormon] about Islam in the United States, or anywhere else, in the year 2013? ... At this moment in history, there is only one religion that systematically stifles free expression with credible threats of violence. The truth is, we have already lost our First Amendment rights with respect to Islam--and because they brand any observation of this fact a symptom of Islamophobia, Muslim apologists like Greenwald are largely to blame.  Harris has criticized common usage of the term "Islamophobia". "My criticism of Islam is a criticism of beliefs and their consequences," he wrote following a controversial clash with Ben Affleck in October 2014 on the show Real Time with Bill Maher, "but my fellow liberals reflexively view it as an expression of intolerance toward people." During an email exchange with Glenn Greenwald, a critic of the New Atheists, Harris argued that "Islamophobia is a term of propaganda designed to protect Islam from the forces of secularism by conflating all criticism of it with racism and xenophobia. And it is doing its job, because people like you have been taken in by it."

what else does he think about it?
"The idea that Islam is a 'peaceful religion hijacked by extremists' is a dangerous fantasy--and it is now a particularly dangerous fantasy for Muslims to indulge.