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Can two short nights make you look less attractive?
A controlled sleep-restriction study found small changes in how strangers rated attractiveness, health, sleepiness and willingness to socialize.
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Can a four-day week preserve productivity?
Reporting subsets of self-selected pilots showed no clear revenue loss as hours fell, but productivity was mostly reported rather than measured; the current record supports a testable work redesign, not a universal output guarantee.
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Can a short nap improve performance?
A 381-person meta-analysis found a small post-nap cognitive benefit, strongest for alertness; nearly all tests were in labs, the average nap lasted 55 minutes, and immediate results were inconsistent.
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Can asking more questions make people like you?
Two text-chat experiments found a modest liking benefit when people were prompted to ask more, while speed-dating data linked follow-up questions to greater second-date interest; responsiveness—not a question tally—is the useful signal.
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Can caffeine protect attention after sleep loss?
Randomized studies and a 45-paper meta-analysis show that caffeine can improve vigilant attention after sleep loss, but it does not fully restore procedural control, and the alertness benefit can fade across repeated restricted nights.
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Can generosity raise social status?
Visible contributors received more prestige and were chosen more often as partners in small-group games; newer studies show when giving reflects cooperative values, economic capacity or strategy.
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Can saying thank you strengthen a relationship?
Possibly: a month-long trial differed on only two of seven outcomes— positive emotion and adaptation, not global relationship satisfaction; better results tracked feeling understood, validated and cared for.
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Does mentorship improve early-career outcomes?
Sometimes. Randomized trials found gains in new-hire productivity and some STEM outcomes, while a 2026 professional workshop changed belonging but not publications or advancement; results varied across access arrangements, programs and outcomes.
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Can structured self-disclosure create closeness?
In the original 45-minute experiment, escalating reciprocal tasks made strangers feel closer than small talk; the study created a temporary feeling, not love, friendship or lasting commitment.
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Are dominance and prestige different routes to social status?
Both predicted influence in new groups, but prestige was associated with likability and freely given deference; dominance predicted rank without the same deference, and its association weakened in some longer studies.
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Do follower counts change credibility?
Twitter and Instagram experiments found that visible audience size could raise or lower perceived credibility, or make no difference; results varied across account structures and post conditions, while one experiment found a larger independent effect for its intended influencer–product-fit condition.
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Do job referrals widen opportunity gaps?
A randomized employee program reduced attrition and labor costs, while observational employer data link referred hires to lower recruiting costs; experiments show incentives and referral constraints change who gets put forward, but eventual hiring or promotion gaps remain unresolved.
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What does a visible luxury logo signal?
Prominent marks can raise perceived status, but experiments also find a warmth penalty when observers infer showing off; the logo alone cannot reveal wealth, motive or insecurity.
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Do names still change job callback rates?
Across more than 83,000 U.S. applications, those with distinctively Black names had an employer-contact rate 2.1 percentage points lower than those with distinctively White names; a Finnish replication found uneven change in combined origin signals by 2024.
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Do shared experiences feel more intense?
The original chocolate experiments found more-extreme evaluations but no difference in direct intensity; the same-room condition of a 2016 spatial-distance experiment found a higher direct-intensity rating, while minimal video studies found no average emotional or enjoyment effect.
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Do wearables increase physical activity?
Across 121 randomized trials, monitor-based programs added about 1,235 daily steps and 49 weekly minutes of moderate-to-vigorous activity; sedentary time did not clearly change, and the hardware was rarely the only intervention.
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Can a silent phone weaken face-to-face conversation?
Two small experiments reported weaker relationship outcomes around a nearby phone, especially during meaningful talks; later replications and a meta-analysis did not support a reliable mere-presence effect.
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Does creatine improve memory?
After a key meta-analysis corrected double-counted outcomes, its overall effect was no longer significant, although an older-adult subgroup remained; newer sleep-loss trials test a narrower stress response, not everyday recall.
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Does Emideltide or DSIP improve sleep?
Small intravenous studies produced mixed results and did not establish an insomnia benefit; no trial tested the nominated subcutaneous route. In 2026, FDA staff proposed not listing either form under 503A, and PCAC separately voted 6–7–1 against each in nonbinding advice.
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Are Epitalon's sleep and longevity claims backed by human evidence?
Human evidence establishes neither. A small study changed a melatonin metabolite without measuring sleep; lifespan claims come from cells, animals or a different pineal preparation, and a 2026 panel vote was not drug approval.
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Does feeling understood predict relationship wellbeing?
Yes—but studies measure different signals: feeling known tracked relationship satisfaction, daily felt understanding tracked same-day wellbeing, and a broader responsiveness composite predicted only one of two long-term wellbeing outcomes.
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Does KPV have human evidence?
FDA found no clinical trial, pharmacokinetic study, case report or documented human exposure to KPV; cell, cadaver-skin and animal studies do not establish efficacy, dosing or safety.
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Does looking busy at work raise perceived status?
U.S. experiments found that long work and little leisure raised perceived status alongside inferred competence and demand; Italian samples reversed the pattern, and a German replication found conspicuous leisure rated higher still.
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Does MOTS-c have human metabolic evidence?
Human studies track the body's own MOTS-c during exercise, while FDA found no clinical administration data; a 120-person Phase 2a metabolic trial is recruiting, with no posted results.
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Does music improve exercise performance?
Across 139 studies, music produced a small average performance gain and made exercise feel more positive; a newer preference review found clearer strength and power effects than speed or aerobic endurance.
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Does pay transparency narrow gender pay gaps?
Sometimes: public disclosure of individual salaries narrowed the gap in Canadian universities and employee-facing pay reports did so in Danish firms; internal reports in Austria and an on-request right in Germany did not.
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Does similarity shape who becomes friends?
Across 1,523 interacting pairs, similarity appeared early rather than growing with closeness; in 41 new students, neural alignment predicted some later network differences but not friends versus all non-friends.
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Can an upward social media comparison lower self-esteem?
In a 128-person profile experiment, high network activity produced slightly lower immediate state self-esteem; a newer diary study and syntheses show why the result cannot support a universal platform verdict.
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Does a lower voice make you seem higher status?
Often—but mainly in perceived dominance, formidability and leader preference. Prestige and trust varied; evidence linking pitch to real-world success was context-dependent and correlational.
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Does working from home improve performance?
There is no universal effect: field experiments range from an 18% decline to a 13% gain; a hybrid trial left measured performance unchanged, and one coordinated office day a month raised calls per hour in a June 2026 trial.
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How much performance can deliberate practice explain?
A corrected 88-study meta-analysis linked deliberate practice to 14% of between-person performance variance on average; new data from 44,213 chess players associated practice type with learning efficiency.
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Is BPC-157 supported by human evidence?
FDA found two abstract-only randomized programs and three uncontrolled reports with 17 or fewer participants; none establishes efficacy, while a new 120-person hamstring trial is still recruiting.
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What did the 2026 FDA peptide hearing actually change?
An advisory committee recommended 503A listing for the free-base and acetate forms of six of seven peptides; no drug was approved, and final FDA action remains pending.
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What does human evidence show about Semax?
Semax has been tested in people, but no replicated, well-controlled study has shown better cognition in healthy adults; FDA also found no human pharmacokinetic study.
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What separates TB-500 from thymosin beta-4?
TB-500 is a seven-amino-acid fragment, not full-length thymosin beta-4; FDA found no administered-human TB-500 evidence, so clinical results for the 43-amino-acid peptide do not transfer.
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Why do humblebrags backfire?
A nine-study program linked the disguise to lower sincerity and liking; petition and real-money tests changed behavior, while ephemeral-post experiments found no reliable disadvantage.
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Can a clear invitation make strangers more likely to talk?
A randomized field experiment found that a clear signal of openness increased reported interaction between strangers—but not every measure of connection.
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When does tracking turn play into work?
Six experiments found that measurement could increase walking or reading while reducing enjoyment by making an activity feel more like work.
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Were the weakest LinkedIn ties best for finding a new job?
Randomized LinkedIn experiments found larger marginal job-transmission estimates for moderately weak ties, with nonlinear and platform-specific results.
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Which social connection best predicts upward mobility?
Across US counties, economic connectedness was strongly associated with upward mobility—but the 72.2-million-user study does not prove individual causation.
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Can an if-then plan close the gap between intention and action?
A meta-analysis of 642 tests found that cue-linked if-then plans helped on average, but robust adjustment cut the estimated effect substantially.
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Is higher local income linked to lower personal happiness?
A US panel study linked higher local earnings to lower self-reported happiness after accounting for own income—but the evidence remains observational.
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Does tracking progress make goals more achievable?
A meta-analysis of 138 randomized studies found that progress-monitoring interventions improved goal attainment on average, with wide variation.
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Is sharing the same space enough to bridge class lines?
A 70.3-million-user network study found that exposure and measured friending bias each accounted for about half of cross-class disconnection.
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Can one email change how workers feel about their pay?
A randomized salary-database email changed satisfaction and job-search intentions for below-median workers, with no measured gain above the median.
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