Old Misconceptions Die Hard: Scientific knowledge suppresses but does not supplant earlier intuitions

ResearchBlogging.orgTeachers operate on the assumption that students are “empty vessels” they can fill with new information.  But many students begin classes with assumptions about the world that, although intuitive, are actually incorrect.  For example, many students incorrectly believe that individuals can evolve or that all members of a species evolve together.  Teachers assume that instruction and testing will make students understand that both of these assumptions are wrong and that only populations evolve.  However, recent research suggests that simply providing students with factual information doesn’t make them drop their faulty assumptions.  As it turns out, old misconceptions die hard.
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Everything is Illuminated: Restoration of vision after transplantation of photoreceptors

ResearchBlogging.orgThe retina is a paper-thin layer of tissue found at the back of the eye that allows us to see light.  Without a retina (or the cells that make it up), we’re blind.  Because mutations that cause the retina to break-down affect nearly 1 in 4,000 people world-wide, researchers eagerly study new ways to treat this condition.  So far, they have identified over 50 genes that, when mutated, cause retinal degeneration and blindness.  In fact, some of the earliest successes in gene therapy involved cases of retinal degeneration and blindness. Now researchers are trying something new: retinal transplants, or physically moving cells from healthy eyes to those that are unhealthy.  In a recent study published by Pearson et al. (2012) in Nature (not open-access, sorry), researchers moved rod photoreceptor cells from healthy mice to those that suffered from night-blindness and — boom! — restored vision to the mice. They even have a cool video. Continue reading