🌍 Planetterrian Daily - Science, Longevity & Health Discoveries
| Naming a single chicken and describing its habits reduces how often preschoolers select poultry for their meals. |
Top 12 Science & Health Discoveries
- Naming one chicken cuts preschoolers' poultry choices — Phys.org
Researchers at SWPS University tested 5- and 6-year-old children in two experiments that varied how an animal was presented. In the first, one group received a silhouette of a chicken named Lelek along with details on its favorite foods and yard habits, while the control group received only a general species description. Children who heard the individual details built toy sandwiches with fewer poultry slices than those who heard the general account. The reduction occurred only among children who already showed low or moderate interest in meat. In the second experiment, presenting the chicken as a unique individual produced stronger reluctance to eat poultry than presenting it as one of many similar birds. The effect remained limited to the same species and left choices about pork unchanged. The paper appears in the journal Appetite. Source: phys.org - Myosin gene sets left or right shell coiling in Japanese snails — Phys.org
University of Nottingham and Tohoku University researchers studied wild Euhadra snails in a Japanese mountain valley where both coiling directions occur and individuals can still mate. Sequence differences in the myosin gene change how cells twist during the earliest embryonic stages. Both left- and right-coiling forms develop into healthy adults without disease or developmental defects. The less common left-coiling variant shows molecular signatures of natural selection across evolutionary time. The same myosin protein participates in building the cell scaffold used by many animals. The findings appear in Current Biology. Source: phys.org - Plants alter more than 1,200 genes within minutes of spaceflight — Phys.org
University of Florida researchers sent Arabidopsis plants on Blue Origin’s New Shepard NS-26 flight in August 2024. An astronaut carried fixation tubes attached to a flight suit and activated them at four mission stages: before launch, at microgravity entry, at the start of descent, and after landing. Matched control tubes were activated on the ground at identical times. More than 1,200 genes showed changed activity, with distinct patterns in leaves versus roots and across successive flight phases. Many of the responsive genes participate in sensing and reacting to environmental stress. The work is published in npj Microgravity. Source: phys.org - Yogurt bacterium reprograms fat metabolism and extends worm healthspan — Bioengineer.org
A bacterial strain isolated from yogurt alters lipid-handling pathways in C. elegans. Treated worms maintained mobility and reproductive function longer than controls. The intervention acts through changes in fat-storage gene networks rather than simple calorie restriction. The finding links a common dietary microbe to measurable aging-related outcomes in a whole-organism model. Source: bioengineer.org - Blocking STING preserves bone mass in aged mice — Lifespan Research Institute
Researchers inhibited the STING pathway in older mice and measured bone density and microarchitecture. Treated animals retained higher trabecular bone volume than untreated age-matched controls. The intervention reduced inflammatory signaling that normally accelerates osteoclast activity with age. The work identifies a cellular pathway that can be targeted to limit age-related bone loss. Source: lifespan.io - Spiny dogfish produce cortisol, a hormone once thought absent in sharks — Phys.org
North Pacific spiny dogfish carry measurable cortisol in their blood. The steroid helps regulate energy use and stress responses in many vertebrates. Earlier assumptions held that sharks rely on different steroids for these functions. The new measurements indicate cortisol presence across a broader range of cartilaginous fishes than previously recognized. Source: phys.org - Adaptive molecular convergence occurs more often than expected across distant species — Phys.org
A comparative genomic analysis of jellyfish relatives and other lineages identified repeated amino-acid changes at the same sites. These parallel substitutions appear under similar selective pressures even in distantly related groups. The pattern suggests convergence at the molecular level is less rare than earlier models predicted. The study draws on multiple independent evolutionary transitions. Source: phys.org - People judge preferences of dissimilar others more accurately than similar ones — Phys.org
Experiments tested how well participants predicted strangers' likes and dislikes when the strangers differed from or resembled the participants themselves. Accuracy rose when targets held preferences distant from the judge's own. The finding challenges the assumption that similarity always improves interpersonal prediction. Source: phys.org - Genetic data question assumptions about settler-Indigenous mixing in New France — Phys.org
A Université de Montréal team extracted DNA from remains in Old Montreal. The genomes revealed ancestry patterns that differ from historical records of European and Indigenous contact. The results indicate more complex admixture histories than standard settler narratives describe. Source: phys.org - Two percent of natural gas delivered to Indianapolis leaks into air — Phys.org
Penn State researchers analyzed nearly a decade of atmospheric measurements around the city. Most leakage originates from inside homes and buildings rather than distribution pipes. The city-wide loss rate reaches approximately 2 percent of supplied gas. The data cover multiple seasons and measurement campaigns. Source: phys.org
Planetterrian Spotlight
The yogurt-bacterium study in worms shows a dietary microbe can shift fat-metabolism gene networks and preserve mobility with age. The effect occurs without broad calorie restriction, pointing instead to targeted changes in lipid-handling pathways. This opens a route to test whether similar strains produce measurable shifts in mammalian metabolic markers of aging. One open question is whether the same bacterial activity alters fat-gene expression in vertebrate models.
Science Deep Dive: How handedness arises during development
Most people assume that left-right body asymmetry is rigidly fixed very early in development and that any reversal must indicate a problem or disease. In Japanese Euhadra snails the direction of shell coiling can go either way while still producing fully viable adults. The direction is set by small sequence differences in a gene that codes for the protein myosin, which helps cells move and reshape themselves by interacting with the internal cell scaffold. During the first cell divisions these sequence variants change whether cells twist clockwise or counterclockwise, and that initial twist propagates through the embryo to determine the final coiling of the shell and the placement of internal organs. Both coiling forms have existed for a long evolutionary time, and the rarer left-coiling version carries molecular signs that natural selection has acted on it. The researchers found a mountain valley population in Japan where left- and right-coiling snails can still mate and exchange genes, providing a natural experiment that avoids the reproductive isolation usually caused by opposite coiling. In contrast, a different gene mutation in pond snails produces left-coiling animals that also show developmental abnormalities, highlighting that not every change in chirality genes is equally benign. The same myosin-based cell-scaffold machinery operates in many animals, including humans, where organ reversals are rare and often linked to health issues. What remains unclear is exactly which additional molecular steps convert the early cell-twist difference into stable, body-wide asymmetry once the initial direction is established.
Today's findings show how small molecular or behavioral changes can shift outcomes from development to daily choices. |
