Be Your Best Friend If You’ll Be Mine: Alliance Hypothesis For Human Friendship:
University of Pennsylvania psychologists studying the cognitive mechanisms behind human friendship have determined that how you rank your best friends is closely related to how you think your friends rank you. The results are consistent with a new theory called the Alliance Hypothesis for Human Friendship, distinct from traditional explanations for human friendship that focused on wealth, popularity or similarity.
Easily Grossed Out? You Might Be A Conservative!:
Are you someone who squirms when confronted with slime, shudders at stickiness or gets grossed out by gore? Do crawly insects make you cringe or dead bodies make you blanch? If so, chances are you’re more conservative — politically, and especially in your attitudes toward gays and lesbians — than your less-squeamish counterparts, according to two Cornell studies. The results, said study leader David Pizarro, Cornell assistant professor of psychology, raise questions about the role of disgust — an emotion that likely evolved in humans to keep them safe from potentially hazardous or disease-carrying environments — in contemporary judgments of morality and purity.
Different Genes Cause Loss Of Body Parts — Pelvis And Body Armor — In Similar Fish:
New research shows that when two species of stickleback fish evolved and lost their pelvises and body armor, the changes were caused by different genes in each species. That surprised researchers, who expected the same genes would control the same changes in both related fish.
Ticklish Apes? Young Apes Hoot Holler And Laugh In Way Similar To Human Infants:
Like human infants, young apes are known to hoot and holler when you tickle them. But is it fair to say that those playful calls are really laughter? The answer to that question is yes, say researchers reporting online on June 4th in Current Biology.
High Population Density Triggers Cultural Explosions:
Increasing population density, rather than boosts in human brain power, appears to have catalysed the emergence of modern human behaviour, according to a new study by UCL (University College London) scientists published in the journal Science. High population density leads to greater exchange of ideas and skills and prevents the loss of new innovations. It is this skill maintenance, combined with a greater probability of useful innovations, that led to modern human behaviour appearing at different times in different parts of the world.
Bee-killing Parasite Genome Sequenced:
Agricultural Research Service (ARS) scientists have sequenced the genome of a parasite that can kill honey bees. Nosema ceranae is one of many pathogens suspected of contributing to the current bee population decline, termed colony collapse disorder (CCD).
Bats Recognize The Individual Voices Of Other Bats:
Bats can use the characteristics of other bats’ voices to recognize each other, according to a study by researchers from the University of Tuebingen, Germany and the University of Applied Sciences in Konstanz, Germany. The study explains how bats use echolocation for more than just spatial knowledge
Scientists Use Bed Bugs’ Own Chemistry Against Them:
Scientists here have determined that combining bed bugs’ own chemical signals with a common insect control agent makes that treatment more effective at killing the bugs. The researchers found that stirring up the bed bugs by spraying their environment with synthetic versions of their alarm pheromones makes them more likely to walk through agents called desiccant dusts, which kill the bugs by making them highly susceptible to dehydration.
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