bmahersciwriter writes "Theoretical physicists propose that the Sun periodically crosses into a dense layer of dark matter sandwiching the Milky Way. The gravitational push and pull that this creates disturbs debris in the Oort cloud sending deadly comets and asteroids ricocheting around the solar system. This passage happens, their admittedly speculative model suggests, every 35 million years, which jibes somewhat with evidence on impact craters. Take it with a dino-sized grain of salt."

StartsWithABang writes "From physics to biology, from health and medicine to environmental and climate science, you'll frequently hear claims that the science is settled. Meanwhile, those who disagree with the conclusions will clamor that science can never be 'settled,' and then the name-calling from 'alarmist' to 'denier' ensues. But can science legitimately ever be considered settled, and if so, what does that mean? We consider gravitation, evolution, the Big Bang, germ theory, and global warming in an effort to find out."

Hugh Pickens DOT Com writes "Amanda Solliday reports at Symmetry that six months ago, organizers of a biweekly forum on Large Hadron Collider physics at Fermilab banned PowerPoint presentations in favor of old-fashioned, chalkboard-style talks. 'Without slides, the participants go further off-script, with more interaction and curiosity,' says Andrew Askew. 'We wanted to draw out the importance of the audience.' In one recent meeting, physics professor John Paul Chou of Rutgers University presented to a full room holding a single page of handwritten notes and a marker. The talk became more dialogue than monologue as members of the audience, freed from their usual need to follow a series of information-stuffed slides flying by at top speed, managed to interrupt with questions and comments. Elliot Hughes, a Rutgers University doctoral student and a participant in the forum, says the ban on slides has encouraged the physicists to connect with their audience. 'Frequently, in physics, presenters design slides for people who didn't even listen to the talk in the first place,' says Hughes. 'In my experience, the best talks could not possibly be fully understood without the speaker.'"

astroengine writes "Out of the thousands of craters scarring the face of Mars, one has emerged as the likely source of most of the Martian meteorites that have been recovered on Earth, a new study shows. Researchers pinpoint Mojave Crater, a 34 mile (55 kilometer) wide basin on the planet's equator, as the origin of the so-called 'shergottites' meteorites, a family that includes about 75 percent of the roughly 150 known Martian meteorites. The crater is located slightly north and east of Meridian Planum, where NASA's Mars rover Opportunity landed in January 2004."

Jim_Austin writes "Academic science labs are generally far less safe than labs in industry; one estimate says that people working in academic labs are 11x more likely to be hurt than their industrial counterparts. A group of grad students and postdocs in Minnesota decided to address the issue head-on. With encouragement and funding from DOW, and some leadership from their department chairs, they're in the process of totally remaking their departments' safety cultures."

sciencehabit writes "Scientists have developed an algorithm that converts simple grayscale images into musical soundscapes. Even people blind from birth can use the technology to 'see' their surroundings and navigate around a room. Equally intriguing, the part of the subject's brain responsible for vision was active during these tasks, suggesting our thinking about how the brain works may be wrong. Instead of a 'vision center' of the brain, for example, we may actually have a region that helps us 'see', whether that input comes from sight or sound."

astroengine writes "Hubble has observed some weird things since it was launched in 1990, but this is probably one of the strangest. In September 2013, the Catalina and Pan-STARRS sky surveys spotted a mysterious object in the asteroid belt, a region of rocky debris that occupy the space between the orbits of Mars and Jupiter. Follow-up observations by the Keck Observatory in Hawaii resolved three separate objects within the fuzzy cloud. It was so strange that Hubble mission managers decided to use the space telescope to get a closer look. And what they saw has baffled and thrilled astronomers in equal measure. 'This is a really bizarre thing to observe — we've never seen anything like it before,' said co-author Jessica Agarwal of the Max Planck Institute for Solar System Research, Germany. 'The break-up could have many different causes, but the Hubble observations are detailed enough that we can actually pinpoint the process responsible.'"

sciencehabit writes "Researchers have found that between 1 and 3% of people don't like music of any kind. These people aren't tone deaf or incapable of grasping the emotional meaning of a song—their brains simply didn’t find listening to music rewarding. While some psychiatric disorders are associated with the loss of the ability to feel pleasure, called anhedonia, the music-haters represent the first evidence for not feeling pleasure from only one specific pleasing stimulant, a condition that has been dubbed music-specific anhedonia. Curious where you fall on the music reward spectrum? The researchers have an online quiz." I know I actively prefer silence to most music, but what I like, I like intensely. Update: 03/06 21:48 GMT by T : Sorry for the garbled submission; now fixed.

MightyMartian writes "'NASA and the White House are asking Congress to bankroll a new intrastellar road trip to a destination that's sort of like the extraterrestrial Atlantis of our solar system — Jupiter's intriguing moon, Europa.' Since Europa seems one of the most likely worlds in the Solar System other than Earth where we have some hope of finding extant life, let's hope Congress gives the green light to this project."

Alain Williams writes "Religious sponsored ignorance is not just in the USA, a school in Hackney, England is trying to hide the idea of evolution from its pupils. Maybe they fear that their creation story will be seen for what it is if pupils get to learn ideas supported evidence. The girls are also disadvantaged since they can't answer the redacted questions, thus making it harder to get good marks."

EwanPalmer writes "The first controlled LSD study in more than 40 years reveals the drug could be used to help people with terminal illnesses deal better with death. The study, published in the Journal of nervous and Mental Disease, showed that 12 people who agreed to take the banned hallucinogenic drug during therapy sessions felt 'significant reductions in anxiety' about their lives ending."

Zothecula writes "Researchers at London's Great Ormond Street Hospital aim to grow a human ear via stem cells taken from a patient's fat tissue. Relatively little attention has been given to the reconstruction of damaged cartilage around the cranial area, however the new method is hoped to modernize this area of reconstructive surgery."

sciencehabit writes "A new, deadly H5N8 strain of avian influenza penetrated the biosecurity defenses of a National Institute of Animal Science (NIAS) campus near Seoul, prompting authorities to cull all of the facility's 11,000 hens and 5000 ducks. The incident highlights the difficulty of protecting poultry farms from circulating avian influenza viruses. 'We are taking this situation very seriously,' said Lee Jun-Won, deputy agriculture minister, at a press conference yesterday in Seoul. He noted that NIAS has the country's most secure facilities and most vigilant staff. Lee said they were looking at three possible routes the virus could have taken onto campus: wild birds, NIAS vehicles, and supply deliveries. 'We will determine the reason for the infection, and we are going to hold those responsible accountable,' he said."

An anonymous reader writes "Mathematics Ph.D. student Jeremy Kun has an interesting post about how mathematicians approach doing new work and pushing back the boundaries of human knowledge. He says it's immensely important for mathematicians to be comfortable with extended periods of ignorance when working on a new topic. 'The truth is that mathematicians are chronically lost and confused. It's our natural state of being, and I mean that in a good way. ... This is something that has been bred into me after years of studying mathematics. I know how to say, “Well, I understand nothing about anything,” and then constructively answer the question, “What’s next?” Sometimes the answer is to pinpoint one very basic question I don’t understand and try to tackle that first.' He then provides some advice for people learning college level math like calculus or linear algebra: 'I suggest you don't worry too much about verifying every claim and doing every exercise. If it takes you more than 5 or 10 minutes to verify a "trivial" claim in the text, then you can accept it and move on. ... But more often than not you'll find that by the time you revisit a problem you've literally grown so much (mathematically) that it's trivial. What's much more useful is recording what the deep insights are, and storing them for recollection later.'"

Shag writes "Type Ia supernovae are used as cosmological 'standard candles' to measure distance because of their strong similarity to one another. This has made possible, for example, the research into universal expansion that led to the Nobel-winning discovery of 'dark energy.' For years, astrophysicists believed white dwarves exploded when they accreted enough mass from companion stars to reach a limit of 1.38 times the mass of our Sun. A decade ago, the 'Champagne supernova' (SN 2003fg) was so bright astrophysicists concluded the limit had been exceeded by two white dwarves colliding. Now a new paper (PDF) from the Nearby Supernova Factory collaboration suggests that type Ia supernovae occur at a wider range of stellar masses. Fortunately, there appears to be a calculable correlation between mass and light-curve width, so they can still fill the 'standard candle' role, and research based on them is probably still valid. (I took data for the paper, but am not an author.)"