The “Collider” exhibition at London’s Science Museum. (Courtesy: Jennie Hills / Science Museum)
By Matin Durrani and Tushna Commissariat
If you’re in the tiny minority of people whose job title says “particle physicist”, chances are you’ll have been to CERN at least once in your career to help build a detector, analyse some collision data or muse in the cafeteria over supersymmetry (or the apparent lack of it so far). But for the rest of the world, going to the Geneva lab is simply not on the agenda, which is one reason why the Science Museum in London has this week unveiled a big new exhibition devoted to CERN’s Large Hadron Collider. Entitled simply Collider, the exhibition “blends theatre, video and sound art with real artefacts from CERN” that will, say organizers, “recreate a visit to the famous particle-physics laboratory”.
Family of four? (Courtesy: Shutterstock/paul_june)
By Tushna Commissariat
In June we reported that physicists working on the BESIII experiment in Beijing and the Belle experiment in Tsukuba, Japan found evidence for a new “charged charmonium” called Zc(3900). A “charged charmonium” is a particle that is made of four quarks – something that had never been seen before. Since that discovery, the BESIII collaboration says it has made “a rapid string of related discoveries” of four-quark particles. “While quarks have long been known to bind together in groups of twos or threes, these new results seem to be quickly opening the door to a previously elusive type of four-quark matter,” says Frederick Harris, spokesman for the BESIII experiment. “The unique data sample collected by the BESIII collaboration has continued to yield a stream of clues about the nature of multi-quark objects.”
Love it, or love to hate it, one thing that social media has undoubtedly achieved is to break down some of the barriers between professional journalists and their readers. Gone are the days when we had to rely almost exclusively on guesswork and intuition when it came to picking the issues that matter the most to our readers. Of course, we have always received “proper” letters in the days and weeks following the publication of Physics World to inform us when readers were pleased (or slightly less approving!) of the words they had read. But these days, the feedback starts pouring in almost as soon as our online articles are published, courtesy of our 170,000 Facebook fans and 50,000 Twitter followers. If our readers’ hackles are raised by certain articles and issues, then believe me – we know about it very quickly.
Just in time for Christmas, researchers at the Massachusetts Institute of Technology (MIT) have unveiled the ultimate “cocktail accessory”. It’s an edible self-propelled boat that whizzes around on the surface of an alcoholic drink.
Not many school pupils can boast having had a world-champion physics teacher, so say hello to Julie McGavigan, who teaches physics at Eastwood High School near Glasgow and bagged a gold medal at the World Karate Championships in Denmark in October.
The 27 year old, who says the win in Denmark came as “quite a shock”, is a 3rd Dan in Shotokan karate and has taught physics for five years after studying the subject at the University of Glasgow.
McGavigan also teaches karate at evening classes at Eastwood High, where she puts physics principles to good use. “Physics helps me understand why certain stances, moves and combinations work when practising karate,” McGavigan told physicsworld.com.
“Wizzing” to the top of the Red Folder this week is a group of physicists at the “Splash Lab” at Brigham Young University who have studied the physics of “splashback” that occurs when people urinate. Using high-speed cameras the researchers filmed jets of liquid from a “synthetic urethra” striking toilet walls. They found that the stream of liquid breaks up into droplets when it is about 15 cm from the urethra exit. “Wizz kids” Tadd Truscott and Randy Hurd suggest that apart from sitting down on the toilet (and risk being called Sitzpinklers by their German friends), men should get nice and close when doing their business to eliminate splashback. Take a look at their video about “Urinal dynamics” above.
The ADMX experiment. (Courtesy: Mary Levin/University of Washington)
By Hamish Johnston
There’s an interesting preprint on the arXiv server that proposes a new way of detecting dark-matter particles. I’ve been thinking about dark matter because last week physicists working on the LUX experiment announced that the underground detector had failed to find any dark-matter particles in the first three months of its operation. LUX was designed to look for WIMPs (weakly interacting massive particles), but WIMPs are not the only game in town when it comes to dark matter. There are also axions, which are the quarry of this latest proposal by three physicists in the US.
Axions are hypothetical particles that were first postulated in the 1970s to help explain puzzling aspects of quantum chromodynamics, which is the theory that describes interactions between quarks and gluons. Axions are also interesting from a cosmological point of view because they have mass but do not interact strongly with electromagnetic radiation. These properties make them prime candidates for dark matter, a mysterious substance that appears to make up most of the matter in the universe.
Exhibit A: a 4 cm-wide meteorite created by the Chelyabinsk asteroid explosion with “shock veins” in it. (Courtesy: Science/AAAS)
By Matin Durrani
If there is one thing that will be remembered about Friday 15 February 2013, it’s that it was the day when a massive asteroid blew up above the city of Chelyabinsk in Russia – creating the largest explosion on the planet since the one that occurred over the Tunguska river in Siberia in 1908.
But whereas hardly anyone saw or recorded information about the Tunguska explosion, the Chelyabinsk asteroid blew up over a relatively densely populated region and – perhaps more importantly – its journey through the air was recorded by numerous cameras and webcams that nervous Russian drivers love to install on their cars. Video footage of the event was soon seen by people all over the world.
Now, based on data from those videos and visits to some 50 local villages, researchers from the Czech Republic and Canada have published a paper in the journal Science detailing the trajectory, structure and origin of what they call the “Chelyabinsk asteroidal impactor”. The paper goes live on Thursday 7 November.
To save you the trouble of reading the full article, I’ve picked out a couple of factoids that might intrigue and interest you.
Are Earth-like planets very common? (Courtesy: Petigura/UC Berkeley, Howard/UH-Manoa, Marcy/UC Berkeley)
By Hamish Johnston
A decade or so ago it would have been reasonable to wonder if the universe contained any planets that resemble Earth. But now that astronomers have discovered more than 1000 planets orbiting stars other than the Sun, it seems perfectly sensible to think that the number of Earth-like planets could be huge. However, actually finding such planets remains a challenge.
This image of the Mona Lisa has been stabilized using technology developed by NASA to study solar flares. (Courtesy: Marblar)
By Hamish Johnston
The best thing about science fiction is that it is fiction, and nit-picking about scientific accuracy shouldn’t get in the way of telling a good story. That’s the theme of Roger Highfield’s review of the latest blockbuster Gravity. Writing in his old paper The Daily Telegraph, Highfield – who now works at London’s Science Museum – takes exception to a series of Tweets by the celebrity astrophysicist Neil deGrasse Tyson about the film. Among other things, the Tweets complain that Sandra Bullock’s hair should be wafting around in zero gravity, not hanging down as it would on Earth. Despite these and other “scientific holes big enough to fly a Saturn V rocket through” both Highfield and Tyson agree that Gravity is a film well worth seeing. The review is called “Gravity: how real is the science?“.