58 Science claim analyses
“Honey does not spoil over time under normal storage conditions.”
The claim is largely accurate. Honey's unique chemistry — low water activity, high sugar content, acidity, and natural antimicrobial compounds — makes it extraordinarily resistant to microbial spoilage when stored sealed and dry at room temperature. Peer-reviewed studies confirm stability over extended periods. However, the claim overstates things slightly: honey can ferment if it absorbs moisture (a realistic household risk), and it does undergo gradual quality changes like flavor loss and darkening over time. It won't make you sick, but "does not spoil" without qualification is an oversimplification.
“Animals can develop allergic reactions to humans.”
The claim is largely accurate. Multiple veterinary dermatologists and biomedical sources confirm that animals — particularly dogs and cats — can develop allergic reactions to human dander (shed skin cells and hair proteins). The underlying immune mechanisms are well-established. However, such allergies appear to be uncommon, prevalence figures vary widely depending on the study population, and diagnostic testing has limitations. The claim is valid but would benefit from noting that these reactions are rare and specific to human dander rather than to humans broadly.
“If all the world's bacteria were stacked on top of each other, the resulting column would stretch approximately 10 billion light-years.”
The claim that stacked bacteria would stretch "10 billion light-years" is misleading. Using the most widely cited estimate of ~5×10³⁰ bacteria at ~2 µm average length, the stack reaches roughly 1 billion light-years — a full order of magnitude less. Even generous assumptions (including archaea) yield ~6 billion light-years. The only sources citing "10 billion" are popular trivia pages, while the original 1998 Whitman estimate actually claimed "a trillion light-years." The general concept of an astronomically vast distance is valid, but the specific figure is not mathematically supported.
“There is more fresh water stored underground as groundwater than in all rivers and lakes combined.”
This claim is true. Multiple authoritative sources — including the U.S. Geological Survey and peer-reviewed research in Nature Geoscience — confirm that fresh groundwater vastly exceeds the volume of water in all rivers and lakes combined, by roughly 100:1 or more. Even conservative estimates of fresh groundwater alone (~10.6 million km³) dwarf the ~105,000 km³ in rivers, lakes, and streams. Note that ice and glaciers still hold more freshwater than groundwater overall, but the claim's specific comparison is well-supported.
“The continent of Africa has land in all four hemispheres: Northern, Southern, Eastern, and Western.”
The claim is true. Africa's landmass is crossed by both the Equator (dividing Northern and Southern Hemispheres) and the Prime Meridian (dividing Eastern and Western Hemispheres), placing it in all four hemispheres. This is confirmed by multiple credible geographic sources including WorldAtlas, Royal Museums Greenwich, and others. The East/West division relies on the conventionally chosen Prime Meridian at Greenwich, but this is the universally accepted standard in geography and cartography.
“Tardigrades are capable of surviving exposure to the conditions of outer space.”
The claim is true. Multiple independent, high-authority sources — including NASA, ESA, NSF, and peer-reviewed research — confirm that tardigrades have survived real exposure to outer space conditions. In the 2007 FOTON-M3 mission, tardigrades survived space vacuum for 10 days and even reproduced afterward. Survival is time-limited and reduced under intense solar UV radiation, but the demonstrated capability to survive space exposure is well-established scientific fact.
“It is possible to create diamonds from peanut butter using scientific methods.”
It is technically possible to convert carbon from peanut butter into diamond under extreme laboratory pressure, as demonstrated by geophysicist Dan Frost at Germany's Bayerisches Geoinstitut. Diamond crystals did form before hydrogen released from the peanut butter destroyed the apparatus. However, this was a single, unreplicated demonstration — not a peer-reviewed or repeatable method. Established diamond synthesis uses pure carbon feedstocks, not complex organic mixtures. The claim is literally true but gives a misleadingly optimistic impression of feasibility.
“Humans use only 10 percent of their brain capacity.”
This is one of the most persistent myths about the brain, but it is definitively false. Modern brain imaging (fMRI, PET scans) shows that humans routinely use all parts of their brain — not just 10%. Even during rest, widespread neural networks remain active. Harvard Health calls the claim "100% fiction," and MIT's McGovern Institute confirms we use our entire brain every day. The brain consumes roughly 20% of the body's energy, which would be biologically wasteful if 90% were unused.
“Planting a large number of trees is the most effective immediate solution to climate change.”
This claim is false. While tree planting is a valuable part of climate strategy, calling it the "most effective immediate solution" is contradicted by overwhelming scientific evidence. Studies in Nature Climate Change and from NASA show that all reforestation potential over 30 years would offset less than one year of global emissions. Trees take decades to store substantial carbon — the opposite of "immediate." The scientific consensus is clear: reducing fossil fuel emissions is far more effective and remains the essential priority.
“The full moon causes an increase in unusual human behavior and events.”
The claim that full moons cause increased unusual human behavior is not supported by scientific evidence. Multiple large-scale studies, meta-analyses, and medical reviews consistently find no meaningful increase in ER visits, psychiatric admissions, crime, or other "unusual events" during full moons. While some isolated studies report small correlations with specific subgroups (e.g., sleep disruption or certain psychiatric conditions), these findings are inconsistent, not replicated at scale, and do not establish causation. This is a persistent cultural myth contradicted by the weight of research.
“Approximately half of the cells in the human body are non-human cells, primarily composed of microorganisms such as bacteria.”
The claim is largely accurate. The best peer-reviewed research (Sender et al., 2016) estimates ~38 trillion bacterial cells versus ~30 trillion human cells, making bacteria roughly 56% of all cells — reasonably described as "approximately half." However, this is a point estimate for a 70 kg adult male with significant uncertainty (~25%) and population variation. The claim also omits that by mass, bacteria account for only ~0.2 kg, so "approximately half" applies to cell count, not biological dominance.
“The Tyrannosaurus Rex lived closer in time to modern humans than to the Stegosaurus.”
This claim is true and well-established in paleontology. Stegosaurus lived ~150 million years ago, while T. rex lived ~68–66 million years ago — a gap of ~80–84 million years. T. rex went extinct ~66 million years ago, and modern humans appeared ~300,000 years ago — a gap of ~66 million years. Since 66 million years is less than 80–84 million years, T. rex indeed lived closer in time to us than to Stegosaurus. Multiple authoritative sources, including USGS and the Natural History Museum, confirm this.
“Bananas are radioactive due to their natural potassium-40 content.”
This claim is true. Bananas contain potassium-40 (K-40), a naturally occurring radioactive isotope that makes up about 0.012% of all potassium. This is confirmed by the US EPA, the Department of Energy, and peer-reviewed scientific literature. However, the radioactivity is extremely small — about 0.1 microsieverts per banana — and eating bananas does not increase your net radiation dose because the body maintains potassium balance and excretes excess potassium. Bananas pose no radiation health risk.
“Plastic waste eventually biodegrades in landfills.”
This claim is false. The overwhelming scientific evidence shows that conventional plastics (polyethylene, polypropylene, PET, etc.) do not biodegrade in landfills. Landfill conditions — anaerobic, UV-limited, and compacted — are hostile to biodegradation. Most plastics persist for centuries, merely fragmenting into microplastics rather than truly breaking down into CO₂, water, and biomass. Even plastics marketed as "biodegradable" often fail to biodegrade under real landfill conditions. The claim gives a dangerously misleading impression that landfills naturally resolve plastic pollution.
“Humans use the left hemisphere of the brain primarily for logical thinking and the right hemisphere primarily for creative thinking.”
This claim is a well-known neuromyth. While some hemispheric specialization exists — the left hemisphere contributes more to language processing, for example — modern neuroscience consistently shows that both logic and creativity involve extensive collaboration between both hemispheres. Large-scale fMRI studies find no evidence of global hemispheric dominance for these functions. Creativity in particular relies on bilateral brain networks, and some studies even show increased left-hemisphere activity during creative tasks. The word "primarily" makes this claim false.
“There are more stars in the Milky Way galaxy than there are trees on Earth.”
This claim is false — it gets the comparison backwards. NASA and ESA estimate the Milky Way contains roughly 100–400 billion stars, while a landmark 2015 Yale/Nature study estimates approximately 3 trillion trees on Earth. Even using the highest credible star estimates, trees outnumber Milky Way stars by a factor of roughly 7 to 30. The popular belief that stars vastly outnumber trees is a common misconception.
“Abyssinian cats learn tricks faster than all other cat breeds.”
This claim is false. While Abyssinians are widely regarded as one of the smartest and most trainable cat breeds, no scientific study has ever demonstrated they learn tricks faster than all other breeds. Multiple sources highlight Bengals, Cornish Rex, Devon Rex, and Siamese as comparably quick learners. Veterinary experts also emphasize that trainability varies more by individual cat than by breed, making the absolute superlative "faster than all other breeds" unsupported.
“Nuclear fission will continue to be used as an energy source over the next 20 years.”
This claim is clearly true. With approximately 440 nuclear fission reactors currently operating worldwide, over 70 under construction, and every major energy forecasting body (IAEA, IEA, World Nuclear Association) projecting continued and growing nuclear capacity through at least 2050, nuclear fission will unambiguously remain in use as an energy source over the next 20 years. Even the most pessimistic credible analyses acknowledge record nuclear output and hundreds of reactors operating well into the 2040s.
“Birds flying at low altitudes is a reliable indicator of an approaching storm.”
There is genuine science behind the idea: birds have baroreceptors that detect falling air pressure before storms, and some species do fly lower in response. However, calling this a "reliable indicator" overstates the evidence. Birds also fly low for feeding, migration, and other non-weather reasons, creating a high false-positive rate. Even the National Environmental Education Foundation notes that low-flying birds "do not always foretell bad weather." No field study has established a validated predictive accuracy rate across species or conditions.
“Short distance driving without allowing the engine to warm up increases engine wear.”
The claim is largely accurate. It is well-established in automotive engineering that cold starts cause elevated engine wear due to insufficient oil circulation, loose metal tolerances, and fuel dilution — and short trips multiply cold-start frequency per mile driven. However, the claim oversimplifies: the severity varies significantly by oil type, ambient temperature, engine age, and vehicle design. Modern synthetic oils and engine management systems have substantially reduced (though not eliminated) this effect. Idling to "warm up" is itself counterproductive; gentle driving is the recommended approach.