Library.

“Men experience greater overall life hardship than women.”

The evidence does not support ranking men as experiencing greater hardship overall. Men fare worse in mortality, suicide, and occupational danger, while women face substantial disadvantages in discrimination, poverty, financial security, development, and gender-based violence. Because no validated measure combines these burdens into an overall comparison, treating male-specific harms as decisive is unjustified.

“Wild tigers generally do not attack humans on sight because they are not interested in humans as prey.”

Evidence indicates wild tigers usually avoid humans and do not typically attack immediately upon seeing a person. Humans are not their normal prey, and many attacks occur in defensive or conflict situations rather than as standard hunting behavior. The caveat is that some tigers do prey on humans under specific conditions, so the explanation is generally correct but somewhat simplified.

“In men, having an excessive amount of body fat causes estrogen levels to become abnormally high.”

Excess body fat in men commonly raises estrogen production through increased aromatase activity, and many studies find higher estradiol or related estrogens in obese men. However, the effect is not universal, and serum estradiol is not always clearly or clinically abnormal in every study or every man. The claim is directionally accurate but stronger than the evidence warrants.

“In humans, taste buds that detect sweetness are concentrated at the tip of the tongue.”

The evidence does not support the idea that sweetness-detecting taste buds are concentrated at the tip of the human tongue. Modern research shows sweet receptors and taste buds are distributed across the tongue, and the classic “tongue map” is widely regarded as a myth. At most, some studies suggest slight sensitivity differences at the tip, but that is not the same as a concentration of sweet-detecting taste buds.

“By around 200,000 years ago, cooking was almost certainly widespread among Homo sapiens.”

Available evidence does not justify saying cooking was almost certainly widespread among Homo sapiens by around 200,000 years ago. The strongest sources say the timing of widespread adoption is unclear, while the clearest Homo sapiens-specific evidence appears later and at particular sites rather than across the species. There is a real kernel of truth—cooking likely has deeper roots in earlier hominins—but this claim overstates both the certainty and the date.

“The majority of a human's brain is almost always active.”

The claim captures the broad scientific picture that the human brain is active across most states, including rest and sleep, rather than lying mostly dormant. However, it overstates precision: activity is uneven across regions, and deep non-REM sleep significantly lowers overall brain metabolism. The statement is best understood as a rebuttal to the "10% of the brain" myth, not as a strict quantitative rule.

“Blushing is an evolutionarily developed mechanism in humans that functions to display emotions and thereby facilitates collaboration and empathy.”

Evidence broadly supports blushing as a likely evolved human social signal that reveals self-conscious emotions and can help repair social relations. But the literature is more specific than the claim suggests: blushing is most strongly linked to appeasement after embarrassment or transgression, not a universal mechanism for collaboration and empathy. Some studies also report mixed or context-dependent effects.

“In humans, the GIP gene functions as an oncogene in ovarian tumors.”

The claim is not supported because it confuses two different genes. The ovarian cancer “gip2” literature refers to GNAI2, not the human GIP gene that encodes an incretin hormone. Studies about incretin drugs or indirect pathway effects also do not show that GIP itself functions as an oncogene in ovarian tumors.

“In adults under typical conditions, the human brain accounts for about 2% of total body weight but consumes about 20% to 25% of the body's glucose or energy.”

The core claim matches standard physiology references: an adult human brain is about 2% of body weight and uses roughly 20% of the body’s energy, with some sources placing glucose use near 20–25% at rest. The caveat is that these figures are usually stated for resting metabolism, and “glucose” and “energy” are related but not identical measures.

“More than 3,000 human genes show sex-specific expression patterns in the human brain.”

Recent high-quality research directly supports the 3,000+ figure: a 2025 single-cell study of the human cerebral cortex reports "over 3,000 unique genes" with sex-biased expression, and independent transcriptomic analyses corroborate counts in this range. However, the claim's unqualified framing omits important context — the number varies substantially by developmental stage (dropping to roughly 1,000 in the adult forebrain), brain region, and methodology, and cross-study consensus on which specific genes are sex-biased remains limited.

“The human brain uses 20% of the body's total oxygen supply.”

The claim is well-supported by multiple peer-reviewed biomedical studies confirming that the adult human brain consumes approximately 20% of the body's total oxygen at rest. This is a widely accepted figure in neuroscience. Minor caveats: the figure applies specifically to adults in a resting/basal state, some sources cite a 15–20% range, and the proportion is significantly higher in young children. These are standard qualifications that don't undermine the claim's core accuracy.

“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.