Science claims here span math proofs, chemistry basics like O2 geometry, and contested headlines on AI, climate change, and Earth science.
412 Science claim verifications avg. score 5.9/10 212 rated true or mostly true 152 rated false or mostly false
“DNA enzymes (DNAzymes) are catalytic, single-stranded DNA molecules capable of performing sequence-specific biochemical reactions.”
The evidence strongly supports the claim. DNAzymes are widely described in the scientific literature as single-stranded DNA molecules with catalytic activity, and many are designed to recognize specific target sequences and carry out reactions such as site-specific RNA cleavage. Caveats about artificial selection or common metal-ion requirements do not contradict that core description.
“Heat discharged from an ocean-based artificial intelligence (AI) data center would harm nearby marine ecosystems.”
The evidence shows a real mechanism for harm, but not a proven general outcome for subsea AI data centers. Marine studies on thermal discharge document biodiversity and oxygen impacts, yet the best direct evidence from Microsoft’s underwater prototype found only slight warming that became unmeasurable within meters and did not show local ecological damage. The broad claim overstates what is currently established.
“U.S. golf courses used about 531 billion gallons of irrigation water in 2024 (about 1.63 million acre-feet of applied water).”
Available evidence supports the stated quantity. Multiple recent sources tied to the national GCSAA/USGA survey report about 1.63 million acre-feet of applied irrigation water in 2024, and that converts directly to roughly 531 billion gallons. The main caveat is terminology: this is applied irrigation water, not necessarily net consumptive water use.
“Freestanding water is not readily available for lions in Kgalagadi Transfrontier Park, resulting in a lack of extra drinking water for lions.”
Natural surface water is indeed scarce in Kgalagadi, but the broader claim is misleading. Reliable sources show the park maintains many artificial borehole-fed waterholes that provide freestanding drinking water and are used by lions. So the evidence supports aridity and limited natural water, not a general lack of accessible extra drinking water for lions.
“In a linear regression model, correlation between two predictor variables can be accommodated by the model without necessarily causing a problem.”
The claim is well supported. Correlated predictors do not automatically violate linear regression assumptions or make OLS estimates biased, and many models handle moderate correlation without serious practical difficulty. The real concern is severe or near-perfect multicollinearity, which can inflate standard errors and make individual coefficients unstable, especially for inference.
“Domestic dogs (Canis lupus familiaris) have hair.”
Veterinary and scientific literature treats the dog coat as hair produced by hair follicles. The common “hair versus fur” distinction is mostly colloquial, not an anatomical contradiction. Rare hairless breeds are exceptions in appearance, not evidence against the species-level fact.
“Ducks have a cloaca through which both feces and eggs pass.”
Authoritative anatomy sources support that ducks have a cloaca, and both feces and eggs pass through it at different times. Some internal structures help keep egg-laying and fecal passage functionally separated, but that does not change the basic fact that both use the cloacal outlet.
“A 2018 Massachusetts Institute of Technology (MIT) study found that false stories spread six times faster than true stories on Twitter and were retweeted 70% more often.”
The claim is well supported by the 2018 Science study and accurate summaries from MIT and Reuters. The study found false news was about 70% more likely to be retweeted and that truth took roughly six times as long as falsehood to reach 1,500 people on Twitter. The "six times faster" phrasing is shorthand for that specific diffusion benchmark.
“Dinosaurs are birds and lizards.”
The claim is not supported by modern taxonomy. Birds are living dinosaurs, but dinosaurs are not simply “birds,” because only one dinosaur lineage survives as birds. Dinosaurs are reptiles within Archosauria, whereas lizards belong to a different reptile branch, Squamata, so calling dinosaurs “lizards” is scientifically wrong.
“In the United States, data centers used about 17 billion gallons of water annually for direct on-site cooling in 2023.”
The available evidence supports a national 2023 estimate of roughly 17.4 billion gallons of direct on-site water consumption by U.S. data centers, so “about 17 billion gallons” is a fair summary. The figure comes from a widely cited Lawrence Berkeley National Laboratory report. The main caveat is that some descriptions include humidification alongside cooling.
“In a vacuum, a metal hammer and a feather dropped from the same height at the same time will land at the same time.”
The evidence shows that a hammer and a feather dropped together in a vacuum will fall with the same acceleration and reach the ground at the same time. This is a standard result of classical physics and has been demonstrated both on the Moon and in vacuum-chamber experiments on Earth. Apparent differences in ordinary air are caused by drag, not by gravity acting differently on heavy and light objects.
“A study published in the journal Patterns estimated that the AI industry consumed between 312 billion and 764 billion liters of water in 2025.”
Reliable primary and secondary sources indicate that a Patterns study estimated AI’s 2025 water footprint at roughly 312.5 to 764.6 billion liters. The attribution and range are substantially correct. The main caveat is that this is a modeled estimate with uncertainty, not a directly measured industry-wide total, and the study’s scope is somewhat narrower than the phrase “AI industry” suggests.
“A person's facial appearance is associated with their personality traits.”
Research supports a small association between facial appearance and some personality traits, but the effect is weak and inconsistent. Several studies and a meta-analysis find above-chance links for certain traits, while other well-powered studies report null results. The claim holds in a limited statistical sense, not as proof that faces reliably reveal personality in everyday judgment.
“Beard length is associated with personality traits.”
Research does show that beard length or fullness is associated with how other people perceive men’s traits, especially dominance, aggressiveness, masculinity, age, and status. But evidence that beard length reliably reflects the wearer’s actual personality is weak and inconsistent. The claim is therefore only partly supported unless it is limited to perceived personality traits rather than real underlying traits.
“Elephants are larger than foxes.”
The evidence overwhelmingly supports this comparison. Elephants are orders of magnitude larger than foxes by weight, height, and overall body size, and even the largest fox species is far smaller than any elephant species. The wording is broad, but the conclusion still holds across the categories involved.
“Wood is highly flammable because it has high carbon and hydrogen content.”
The claim overstates and misidentifies the reason wood burns. Wood does contain a lot of carbon and some hydrogen, which help determine heat released during combustion, but fire behavior studies show that wood’s flammability depends mainly on pyrolysis, moisture, density, species, and oxygen conditions. The stated cause is too simplistic to be accepted as accurate.
“Pandey, Hyun, Yu, and Lee (2021) analyzed 36 captive big cats (tigers, lions, and leopards) at Seoul Grand Park Zoo using PCR amplification of 33 microsatellite (STR) loci and reported that leopards had the highest genetic diversity, followed by lions and then tigers.”
The claim is well supported by the 2021 indexed study. The paper describes 36 captive tigers, lions, and leopards from Seoul Grand Park Zoo, analysis of 33 microsatellite loci, and a diversity ranking with leopards highest, then lions, then tigers. The exact author listing is less directly shown in the provided snippets, but nothing in the evidence contradicts it.
“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.
“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.”
“In a spinach leaf-disc floating assay, spinach leaf discs exposed to higher light intensity from a 100 W lamp positioned about 18 cm away floated sooner and in greater numbers over 15 minutes than discs exposed to natural light, while discs kept in darkness (wrapped in aluminium foil) showed no flotation over 15 minutes.”
The described outcome matches how the floating leaf-disc assay ordinarily behaves: stronger light usually makes spinach discs float faster, while discs kept dark usually do not float. The evidence solidly supports that overall pattern. However, the exact setup and timing stated here—100 W lamp, about 18 cm, natural light comparison, and a 15-minute endpoint—are not all directly confirmed by the strongest sources.