Reddit science
1Dogs seem to associate ‘bouba’ with round shapes and ‘kiki’ with spiky shapes, study of 70 dogs finds
- Dogs, like humans, appear to link the made-up sound "Bouba" with round shapes and "Kiki" with spiky ones. In a study led by Eleonora Biffi at the University of Parma, 70 dogs looked longer at the rounded shape when "Bouba" played and at the spiky shape when "Kiki" played.
Innate or learned origin
Commenters debate whether the bouba-kiki link is innate to language or absorbed from humans over about 10,000 years of domestication, with some suggesting it may extend to other animals.Methodological concerns
Many users worry dogs read owners' subtle cues, a Clever Hans effect, since owners were present. Others note the sample was small, the study needs replication, and the headphone-controlled second run helped address bias.Sound waveforms explain it
Several users argue the link is physical: "k" sounds are sharp and abrupt while "bou" sounds are smooth and low, so spiky words naturally match spiky shapes and pitch tracks object size.
2A 2026 study reveals that human ovaries remain biologically active after menopause, shifting their protein production with age to actively influence other organs and create an inflammatory environment linked to increased ovarian cancer risk.
- Menopause may not be a full retirement for ovaries. A study of 28 postmenopausal women found that ovarian protein profiles shift with age, with older ovaries showing more inflammation and lipid-related proteins. These changes may help explain higher ovarian cancer risk after menopause.
Removing fallopian tubes to cut cancer risk
Commenters say most ovarian cancers reportedly start in the fallopian tubes, so some women had them removed for sterilization and cancer risk reduction, with easy recovery. Others were refused or dismissed when they asked.Evolutionary purpose of menopause
Users debate why menopause evolved, citing the grandmother hypothesis and examples like orcas and elephants. Others say the hypothesis is unproven and that pregnancy risks at older ages may also explain it.Hormone replacement therapy benefits
Commenters say HRT relieves menopause symptoms and can be used for decades. One user argues stigma and lack of awareness keep many women from using an effective treatment for hormone deficiency.
3New Study Finds Gendered Messaging Can Backfire: Messages that reference gender when highlighting women's success in an activity actually made kids and adults of both genders see girls and women as less capable, and also made everyone less interested in trying the activity themselves.
- Gender-focused messages like "Women's Chess Champion" can backfire, according to a study of over 1,100 participants. Such messaging made people think fewer women participate, judged women as less capable, and reduced interest in the activity, especially among adults. Simply showing women succeeding without emphasizing gender is more effective.
Soft bigotry of low expectations
Many commenters say "first" milestones and "even someone like you can do it" framing feel patronizing. They argue it implies a group is unusually capable only by default and makes achievements seem exceptional rather than normal.Historical milestones versus implied exceptionality
Others defend "first woman" acclaim as marking barriers overcome, citing Marie Curie's context. Critics respond that such labels can unconsciously suggest an achievement is unusual for that group, even without intent to belittle.Gender-specific support programs
STEM participants say women-only programs and "girls can do it" support can make women feel like outsiders, under extra scrutiny, and implicitly less capable. Some note high dropout rates among women in STEM.
4Stanford study finds severely bleached corals can make a full recovery in seven weeks with help from healthy clones
- Stanford researchers found that bleached corals fully recovered within seven weeks after touching healthy coral from the same genetic clone. Scientists say the method is promising but may not yet be practical for restoring wild reefs.
Cloning resistant corals
Commenters praised the idea of cloning heat-resistant corals to restore reefs, but noted that requiring genetic matches for each coral may not scale. Suggestions included a coral "seed bank" of diverse species for breeding and transplanting clones.Climate change as root cause
Users questioned whether the underlying cause of bleaching, rising ocean temperatures and acidity from climate change, must be addressed first. Several doubted it will be reversed soon, and the transplant approach was seen as incomplete without it.Heat tolerance needed
A commenter argued that the next step is making corals tolerant of temperature changes. Replies noted that the study's approach likely doesn't address fluctuating or rising water temperatures.
5We’re surprisingly close to conserving 30% of the world’s land. Almost every country has agreed to conserve 30% of the land and sea by 2030. Study shows 27% of land may already be conserved for biodiversity, if you also count areas that aren’t globally recognised. But more work needs to be done.
- Research suggests the world is surprisingly close to its goal of conserving 30% of its land area.
Progress toward the 30% target is overstated
Commenters argue the protected land is mostly deserts, tundra, and rocky slopes rather than fertile or coastal areas, so the headline is misleading. Others cite real restoration projects, while noting official figures show progress has stalled.Politics is undermining public land protection
Users point to Idaho selling state-protected land, grazing on conservation areas, and U.S. federal rollbacks and privatization. Some note hunters and conservationists could agree, but politicians ignore them.Population, consumption, and management matter too
Commenters say 30% may not be enough for biodiversity and call for larger wild areas. They also cite population growth, veganism, AI data centers, and active wildlife management as factors.
6Plastic tea bags released 555–2,498 microplastic particles per cup versus 0.3–2.4 in loose tea in a 28-brand brewing study
- Plastic tea bags release far more microplastics (555–2498 particles per cup) than bulk tea (0.3–2.4 per cup), with the bag debris consisting of polyamide fibers. Bisphenol A intake from bagged tea reached 21.7% of the EFSA tolerable daily intake, though overall health risk stayed below threshold. The authors suggest favoring bulk tea and stricter regulation of food-contact packaging.
Study's geographic representativeness
Commenters note that 13 of 14 tested brands were made in Turkey, so results may not reflect other countries' standards. Testing brands from more markets, with matched bag materials, was suggested.Plastic versus paper tea bags
Many paper bags are heat-sealed with plastic, and pyramid bags are plastic mesh. Some brands now use plant-based PLA or no plastic, and loose-leaf tea in a metal or fabric strainer was recommended.Microplastics in everyday life
Commenters argued that people inhale many microplastics indoors and from tires, so tea is one source among many. Others said inhalation is a different exposure route, so the counts aren't directly comparable.
7Why story and play time really matter for toddlers. Comparing moments with periods spent watching a movie together, the study found that those playful, interactive moments are associated with increased brain activity linked to attention, learning and social processing.
- Northwestern University researchers found that toddlers' brains show more engagement during playful interactions with parents, such as reading and puzzles, than while watching movies. Brain activity linked to attention, learning, and social processing was higher during these moments. Toddlers with autism or slower language development showed similar brain patterns to typically developing peers.
Interactive play beyond parents
Commenters suggest the benefits of interactive play may extend to peers and siblings, since the study compares interaction with passive watching. However, the 24-44 month olds studied are generally too young for cooperative peer play.Parental pressure and practical limits
A parent says constant interaction isn't always practical or wanted, since kids often just want their parent nearby. Reading is seen as the most useful shared activity, and some parents rely on TV while cooking dinner.Video games as interactive play
A commenter questions whether video games fit the study's findings, and a reply argues that active participation differs from passive viewing. One parent says their 2-year-old enjoys directing play in Animal Crossing.
814-year study of 3,093 adults using Fitbit data, finds that those averaging 8,875–14,161 daily steps performed better on tests of attention, cognitive control and decision-making than those averaging 5,108 steps. Higher systolic blood pressure was also linked to poorer cognitive performance
Moderator guidelines on personal anecdotes
A moderator explains that personal anecdotes are allowed only as replies to their comment, while anecdotes elsewhere will be removed. The comment also invites users with academic degrees to apply for flair.Motion is lotion
A commenter jokes that the saying "motion is lotion" applies beyond joints, playfully linking the adage to the study's findings on physical activity.Motivation to get moving
A commenter says the study inspired them to go for a walk, showing how the research on activity tracking motivated a personal change.
9Perovskites promise to boost solar power, but internal defects have blunted their potential. Now, researchers have fixed that problem by adding a mixture of zinc bromide and methyl ammonium chloride early in the fabrication process, raising efficiency [Science]
- Researchers have fixed internal defects in perovskite solar cells by adding a special chemical mix during manufacturing. The fix lets the cells hold onto sunlight energy far longer, potentially boosting power output as energy demand grows.
Degradation and stability
Commenters asked about progress on stability. A cited 2024 review says early cells lasted hours, while some now run thousands of hours at high temperature. One skeptic called performance and cost poor.Defects in large-area printing
A commenter asked whether the reported reduction in defects still holds when crystals are printed over large areas, since the article identifies printing as a source of defects.Fragility and practicality concerns
One commenter said perovskites are very finicky and need extreme environmental isolation, and claimed some optical physicists consider them a dead end.
10Pensions save lives – Researchers analyzed the introduction of public pensions in the UK in 1909, finding that they substantially reduced elderly mortality.
- The 1908 UK Old-Age Pension Act, which gave means-tested pensions to people aged 70+, appears to have reduced elderly mortality in England and Wales (2.7–12.5%), with declines concentrated in infectious and non-infectious disease deaths. The authors attribute this to less crowding (fewer elderly in poorhouses) and pension-induced retirement from high-mortality jobs.
Pensions versus 401ks
Commenters say Social Security was meant to be one leg of a three-part retirement plan with pensions and personal savings. US pensions gave way to 401ks from the mid-1980s, which offer far less security.Economic value of elder survival
Users question how to justify reducing elderly mortality in a productivity-focused economy. One suggests grandparents enable parents to work and pay taxes. Others doubt the capital class cares, and note AI may reduce workforce needs.Common sense versus evidence
Commenters say the findings seem obvious but still need data to support policy. Evidence helps resist cuts such as proposed Australian healthcare changes. Before Social Security, many elderly without family in the US froze or starved.