2,548 published verifications avg. score 5.6/10 1,246 rated true or mostly true 1,065 rated false or mostly false
“Sam Altman said that Loopt had 100 times more users than 500 and said he would provide evidence but did not provide evidence.”
The core account is supported: Sam Altman publicly rejected the reported 500-user figure for Loopt, indicated it was far too low, and said he would provide data. The strongest caveat is that the precise “100 times” wording is better supported as a paraphrase from secondary reporting than as a clearly documented direct quote. No public evidence release matching that promise is evident in the record provided.
“Hydrazine Capital invested up to 75% of its capital in companies funded by Y Combinator.”
The available evidence supports the main point that Hydrazine Capital was heavily concentrated in Y Combinator-backed companies. A credible published report gives the 75% figure directly, and other coverage is consistent with a strong YC focus. The main caveat is that the exact percentage appears to rest on a secondhand citation rather than primary fund records or repeated independent confirmation.
“Loopt had only 500 users near the end of its operation.”
The evidence does not support the statement that Loopt had only 500 users near the end. Reliable contemporaneous reporting around the sale put Loopt at about 3 million registered users, while the “500” figure came from an unverified report about daily active users and was explicitly disputed by the company. The claim omits that crucial distinction and therefore states something materially wrong.
“There are more than 20 active volcanoes in the world.”
Authoritative volcanology sources place the number well above 20 under any standard meaning of “active volcano.” Global Volcanism Program data show roughly 40–50 volcanoes in continuing eruption, and USGS-style broader counts of active or potentially active volcanoes are in the thousands. The claim is therefore clearly supported.
“The European Union’s recast Energy Efficiency Directive (adopted in 2023) will substantially change how data centers are cooled in the European Union.”
The directive does create meaningful new pressure on data-center cooling practices in the EU. It mandates cooling-related reporting and, for larger facilities, waste-heat and cost-benefit requirements that can drive redesigns and operational changes. But it does not set blanket EU technical cooling standards, so the scale of change will vary by facility size, feasibility and national implementation.
“Tycho Brahe died because he was unable to defecate (i.e., he died from constipation or urinary retention caused by not urinating/defecating).”
The claim misstates the basic medical issue. The historical and modern evidence points to urinary retention and related complications, not constipation or inability to defecate. Some accounts do link Brahe’s death to not urinating, but even that is not a simple confirmed “held it too long” story; newer analyses suggest deeper prostate or metabolic disease may have caused the retention.
“From 1945 to 1949, the United States had a monopoly on nuclear weapons.”
The historical record supports the core claim. The United States was the only country with nuclear weapons from the first U.S. atomic test in July 1945 until the Soviet Union’s first successful test in August 1949. The only meaningful caveat is that the year range is shorthand, not an exact claim about every day of 1945 and 1949.
“The United States helped rebuild Europe after World War II.”
Historical evidence clearly shows the United States materially supported Europe’s postwar recovery, chiefly through the Marshall Plan. U.S. economic aid helped restore industry, infrastructure, and agricultural production in multiple European countries. The statement is accurate because it claims assistance, not sole responsibility for rebuilding.
“The United States helped rebuild Japan after World War II.”
Historical evidence clearly supports this. The United States led the occupation, implemented major reforms, and provided significant food and financial aid that contributed to Japan’s reconstruction after 1945. Strategic motives or the fact that Japan also rebuilt itself do not change the core fact that the U.S. helped rebuild Japan.
“Elon Musk said that the United States' post-World War II reconstruction of Europe and Japan was unusual and almost unprecedented behavior.”
The attribution is well supported by direct video evidence and multiple independent news reports. Musk is on record, in a Lex Fridman podcast clip, describing U.S. post-World War II rebuilding of Europe and Japan as "very unusual behavior, almost unprecedented." The claim slightly paraphrases his wording but preserves the substance accurately.
“Providing substantial assistance to rebuild other countries after major wars is almost unprecedented behavior in world history.”
The claim is not supported by the historical record. Large-scale postwar rebuilding assistance was not unique to the Marshall Plan era: documented examples include post-WWI assistance to Germany, League of Nations reconstruction programs, American relief and recovery operations, and the broader post-1945 institutionalization of foreign aid and reconstruction. The Marshall Plan was exceptional in scale, not in the basic behavior it represented.
“According to the Hong Kong Local Flying Chart HM100LFC, unlicensed or student pilots are absolutely not permitted to fly north of “LINE A” (the blue dotted line), and the areas labeled Port Shelter (牛尾海), Tolo (吐露港), and New Town (新市鎮)—which are south of LINE A—are restricted areas.”
The evidence does not support this reading of the chart. HM100LFC may show LINE A as an operationally relevant boundary, but official Hong Kong aviation sources indicate that binding restrictions come from the AIP, NOTAMs, and regulations—not from treating the chart itself as an absolute ban. The labels Port Shelter, Tolo, and New Town are not shown by the cited official sources to be restricted areas merely because they appear south of LINE A.
“No New Zealand national rugby union team (the All Blacks) has ever beaten every Rugby Championship nation and every Six Nations nation within a rolling 12-month period.”
The evidence neither cleanly confirms nor refutes this sweeping historical claim. While match records suggest the All Blacks' dominant 2013 season and other periods likely included wins over all Rugby Championship and Six Nations opponents within 12 months, no authoritative source in the available evidence explicitly documents such a rolling sweep. Claims that the feat was achieved rest on inference from match logs rather than direct confirmation, and the absolute 'never' framing cannot be verified from encyclopedic summaries alone.
“Ex vivo CRISPR-based therapies for sickle cell disease typically require myeloablative conditioning with busulfan before reinfusion of edited hematopoietic stem cells.”
Current evidence shows busulfan-based myeloablation is the standard preparative step before reinfusion in ex vivo CRISPR sickle cell therapies. FDA labeling for Casgevy and published trial reports describe busulfan conditioning, and broader reviews say busulfan remains the usual regimen across these autologous ex vivo approaches. Alternative conditioning strategies exist in research, but they are not yet typical practice.
“Hydroxyurea treatment for sickle cell disease increases fetal hemoglobin production and reduces red blood cell sickling.”
The claim matches the established medical evidence. Hydroxyurea is a standard disease-modifying therapy for sickle cell disease because it raises fetal hemoglobin, which in turn suppresses hemoglobin S polymerization and reduces red blood cell sickling. Individual response varies, but that does not materially change the core conclusion.
“The 2021 Frangoul et al. report on CTX001 stated that the sickle cell disease patient had increased fetal hemoglobin and experienced no severe pain crises during approximately 16.6 months of follow-up.”
The claim matches the 2021 Frangoul et al. report. The paper states that the sickle cell disease patient had increased fetal hemoglobin after CTX001 and experienced no vaso-occlusive episodes during about 16.6 months of follow-up. A minor nuance is that some detailed HbF characterization was reported at a shorter timepoint, but that does not undermine the claim as written.
“Sickle cell disease is caused by inherited mutations in the HBB gene that produce hemoglobin S, which polymerizes under low-oxygen conditions and causes red blood cells to sickle and obstruct small blood vessels, leading to vaso-occlusive pain crises and organ damage.”
The claim accurately summarizes the core, well-established pathophysiology of sickle cell disease. Authoritative sources agree that inherited HBB mutations produce hemoglobin S, which polymerizes when deoxygenated, causing red cells to sickle, impair flow in small vessels, trigger vaso-occlusive pain crises, and contribute to organ damage. Additional inflammatory and adhesion mechanisms exist, but they do not overturn this central mechanism.
“Long-term regular blood transfusions for sickle cell disease can cause iron overload.”
Long-term regular transfusions in sickle cell disease are a well-established cause of transfusional iron overload. Multiple authoritative reviews and clinical studies show that repeated transfusions add iron faster than the body can remove it, causing iron accumulation over time. The risk may be lower with some exchange-based regimens, but the claim itself is accurate.
“Many CRISPR-based sickle cell disease clinical trials primarily edit the BCL11A gene or its enhancer to reactivate fetal hemoglobin rather than directly repairing the HBB mutation.”
The evidence shows that BCL11A or its erythroid enhancer has been a central target in multiple CRISPR sickle cell trials, including the approach behind Casgevy/exa-cel. These programs aim to reactivate fetal hemoglobin rather than directly fix the HBB sickle mutation. Other editing strategies exist, but they do not undermine the claim’s use of “many.”
“Trinidad and Tobago was left without water after an earthquake in Venezuela.”
The evidence does not support the claim that Trinidad and Tobago was left without water after an earthquake in Venezuela. Credible reports describe a section of Trinidad’s coastline being uplifted, which left marine animals stranded out of seawater on one beach. They do not show the country lost drinking water or public water service.