History.

“Residents of Synanon were instructed to focus on themselves and to avoid caring for personal relationships that were viewed as hindering sobriety or self-improvement.”

The historical record shows Synanon systematically subordinated family and intimate ties to its recovery program and group control. Multiple reliable sources describe no-contact rules, forced divorces, communal child-rearing, and pressure against relationships seen as obstacles to sobriety or self-improvement. The main caveat is wording: the evidence better supports restricting and reshaping relationships than a blanket instruction not to care about any personal relationship.

“Adolf Hitler started World War II.”

The evidence strongly supports attributing the outbreak of World War II in Europe to Hitler. As leader of Nazi Germany, he ordered the invasion of Poland on September 1, 1939, which triggered the declarations of war that conventionally mark the war’s start. The main caveat is that this is historical shorthand for a broader, multi-causal conflict.

“Chinese workers building the Canadian Pacific Railway were paid about one dollar per day and were assigned dangerous work such as explosives and demolition.”

Historical evidence clearly supports the core claim. Chinese CPR workers were commonly paid about $1 a day in nominal wages, and many were assigned the most dangerous tasks, especially blasting and tunnelling with explosives. The main caveat is that actual take-home pay was often lower after deductions, and sources usually describe blasting rather than "demolition."

“Jean Piaget shifted psychology away from behaviorism and helped found modern cognitive developmental psychology.”

The core of the claim is well supported: Piaget was a foundational figure in modern cognitive developmental psychology. The weaker part is the assertion that he shifted psychology away from behaviorism; the evidence more clearly shows that his ideas became influential after behaviorism’s dominance faded, rather than that he alone drove that transition. The claim is substantially accurate but overstated at that point.

“In 1973, the American Association on Mental Retardation changed the IQ cutoff for diagnosing mental retardation from below 85 to below 70 because more than half of African Americans scored below 85.”

The historical record supports the threshold change, but not the claimed racial motive. Reliable sources show the 1973 revision returned to a two-standard-deviation cutoff, removed the borderline category, and was associated with concerns about overidentifying minority students. No authoritative source shows the organization changed the standard specifically because more than half of African Americans scored below 85.

“In Honoré de Balzac’s novel "Lost Illusions," Balzac argues that costume is important for people who want to appear to possess what they lack because appearing to have it can be a first step toward obtaining it.”

The claim accurately paraphrases a passage in Lost Illusions. In the novel, Balzac’s narrator explicitly says clothes are crucial for those trying to advance and that the appearance of possession can be the quickest route to actual possession. That framing matches both the wording and the theme of social performance in the book.

“The first Summer Olympic Games held after World War II took place in the 1940s.”

Authoritative historical records show that the first Summer Olympics after World War II were the London Games in 1948. Because 1948 falls within the 1940s, the claim is fully supported. The cancelled 1940 and 1944 Games are the key context explaining why 1948 was the first postwar Summer Olympics.

“Mao Zedong adapted Marxism–Leninism to China's predominantly peasant society by emphasizing a rural-based revolutionary strategy rather than an urban industrial working-class revolution.”

The historical record supports this characterization. Mao’s major adaptation of Marxism–Leninism to Chinese conditions was to center revolution on the peasantry, rural base areas, and a countryside-to-city strategy instead of the classic urban industrial-worker model. The main nuance is that Mao did not theoretically discard proletarian leadership; he recast it within a worker-peasant alliance.

“Viking ships were built using the clinker-building method with overlapping planks, which made them lightweight, durable, and flexible in rough seas.”

The evidence strongly supports this description of Viking shipbuilding. Major museum and reference sources agree that Viking ships were clinker-built with overlapping planks, a method that created light, strong hulls with enough flexibility to handle rough water well. The main caveat is that scholars debate whether that flexibility was intentionally engineered or emerged as a consequence of lightweight construction.

“The Viking people originated from Scandinavia, specifically the areas that are now Norway, Sweden, and Denmark.”

Historical scholarship overwhelmingly places Viking origins in Scandinavia, especially the regions that are now Denmark, Norway, and Sweden. Major encyclopedias, museums, and academic sources use this framing consistently. Later expansion to places like Iceland does not change the accepted homeland of the Viking Age peoples.

“Viking longships used a large square sail combined with oars for propulsion.”

The evidence strongly supports this description of Viking longships. Archaeological finds, ship reconstructions, museum research, and standard reference works all indicate that longships were propelled by both oars and a large square sail. The lack of surviving sail fabric affects fine details of sail construction, not the core conclusion.

“Viking ships had shallow draughts that allowed them to navigate up narrow rivers and to be beached directly on coastlines for surprise attacks.”

The evidence strongly supports this description of Viking longships. Authoritative museum, archaeological, and reference sources consistently state that their shallow draught and light construction let them travel in shallow water, move up rivers, and be beached directly for rapid landings, which helped make raids more sudden and flexible.

“Norse Vikings reached North America by trans-Atlantic travel.”

Archaeological evidence firmly shows that Norse Vikings reached North America by crossing the Atlantic. The best-supported site is L’Anse aux Meadows in Newfoundland, where Norse presence has been scientifically dated to about AD 1021. The main caveats are about scale and route, not arrival itself.

“Viking longhouses were long, narrow, and typically windowless structures built from timber, stone, and turf, with a central fire trench used for heat.”

The description is broadly accurate and matches standard accounts of Viking domestic architecture. Reliable museum and reference sources describe long, narrow longhouses built mainly from timber with stone and turf components, and heated by a central indoor fire. The main caveats are wording: many sources say hearth or long fireplace rather than "fire trench," and some houses had tiny openings rather than being fully windowless.

“A photograph of Werner Goldberg appeared in the newspaper Berliner Tageblatt with the caption "Der ideale deutsche Soldat" ("The ideal German soldier").”

The evidence supports that Werner Goldberg’s photograph was published in Berliner Tageblatt with the caption “Der ideale deutsche Soldat.” The strongest support comes from archival and major historical reference sources. Some later retellings appear to misstate the date, but that does not materially change the core fact of the publication and caption.

“The Battle of Berlin was fought primarily between the Soviet Red Army and the remnants of Nazi Germany.”

The core description is accurate. The Battle of Berlin was overwhelmingly a Soviet Red Army offensive against the collapsing armed forces and militias of Nazi Germany. Polish units also took part, and the German defenders were a mixed last-ditch force rather than only regular army units, but those details do not materially change the claim’s main meaning.

“During the Battle of Berlin (April–May 1945), the primary Soviet commanders were Georgy Zhukov and Ivan Konev, operating under Joseph Stalin's overall leadership.”

The historical record supports this description. Zhukov and Konev commanded the two main Soviet fronts driving on Berlin, and Stalin, as head of Stavka and supreme commander, exercised overarching strategic leadership. The wording is somewhat compressed, but it does not materially distort who led the battle.

“The Battle of Berlin was the final significant attack of World War II in Europe.”

The claim overstates Berlin’s place in the war’s final days. The Battle of Berlin was a decisive and often-described final major blow against Nazi Germany, but it was not clearly the last significant attack in Europe, because substantial fighting continued afterward, including the Prague Offensive and other post-Berlin engagements. The evidence better supports calling Berlin one of the last major battles, not the final significant one.

“Germany signed an unconditional surrender on May 7–8, 1945, which is commemorated as V-E Day.”

The historical record supports the claim. Germany signed an unconditional surrender at Reims on May 7, 1945, with a second signing in Berlin on May 8–9, and the surrender took effect on May 8, the date widely commemorated in Western countries as V-E Day. The main caveat is that Russia and some others observe May 9 because of the later Berlin signing and time-zone differences.

“Adolf Hitler directed German military operations from the Führerbunker in Berlin during the Battle of Berlin and committed suicide on April 30, 1945.”

The historical record strongly supports this account. Multiple authoritative sources show Hitler was directing the defense of Berlin from the Führerbunker during the battle, even as his orders became increasingly unrealistic and militarily ineffective. Independent archival, eyewitness, and forensic evidence also consistently place his suicide in the bunker on April 30, 1945.