Category Archives: General
By James Dacey, reporting from Sheffield
For the past few days I’ve been back to the place where I grew up: the city of Sheffield in the north of England. It’s famed for its steel production and snooker, but I’ve been in town for what is billed as the world’s most exciting documentary and digital media festival: Sheffield Doc/Fest. There has been an eclectic mix of films and audio documentaries from around the world to enjoy but I’ve been focusing on a strand of the festival dedicated to “Ideas & Science”.
By Hamish Johnston
At first glance, visible light and nanotechnology seem incompatible because of the diffraction limit, which dictates that features smaller than about half the wavelength of light cannot be resolved optically. For visible light, the diffraction limit is about 300 nm and this means that there is no point in trying to make conventional optical components that are any smaller.
But that pessimistic outlook has changed over the past decade or so thanks to the development of nanophotonics, which makes use of near-field (or evanescent) light and plasmons to manipulate light on length scales much smaller than the diffraction limit. Today, nanophotonics is being used across a range of disciplines, including biological imaging, telecommunications, solar energy and semiconductor processing.
By James Dacey, reporting from Sheffield
“I wanted to make a film about an old space cowboy” is how British director Mark Craig introduced his new film on Sunday afternoon here at Sheffield Doc/Fest. The Last Man on the Moon takes a fresh look at the the Apollo era through the story of Eugene Cernan, who was the last person to set foot on the lunar surface when he did so in 1972 as commander of Apollo 17.
The documentary interleaves a profile of “Gene” Cernan with NASA archive footage and special effects, focusing on the personal stories of the astronauts and their families. To give you a flavour, the film opens in the present day with close-ups of Cernan’s facial reactions at a rodeo event as he admires the spectacle and the bravery of the men being thrown around on the back of bulls. Later in the film, Cernan recounts his experiences of being rotated rapidly in space during the Gemini 9A and Apollo 10 missions.
Immediately after the showing, Cernan and Craig stayed for a Q&A session and the audience gave an extended standing ovation as the 80-year-old astronaut walked to the front of the auditorium. I was fortunate to catch up with the pair this morning to get some insights into the inspiration for the film and how it was adapted from the book Cernan co-authored in 1999.
By Matin Durrani
One of the beauties of physics, I’m sure you’ll agree, is that it stretches from the very big (cosmology) to the very small (particle physics). In fact, the great questions at the heart of those fields may well have attracted you to physics in the first place. But a lot goes on in-between these extremes, not least at the nanoscale. It might lack the glamour of research into dark energy or the Higgs boson, but nanotechnology has far more of an immediate impact on everyday life than physics at either end of the length scale.
If you want to find out about some of those applications, take a look at the latest Physics World focus issue on nanotechnology, out now in print and digital formats. It covers, for example, the work of the UK firm P2i, which has developed a “dunkable” nano-coating that can keep a mobile phone functioning after being submerged in water for up to half an hour. Could be handy next time you go swimming.
By Matin Durrani in Cheltenham
I made the short journey yesterday from Bristol to the regency spa town of Cheltenham, which this week is hosting its annual science festival. One of the largest such events in the UK, it’s been running since 2002 and has a packed programme of A-list speakers and topics ranging from genetics to geology, from cocktails to cake, and from the human brain to the Higgs boson.
My main reason for attending the festival, though, was to meet Caltech physicist Sean Carroll, whose book about the search for the Higgs boson (called The Particle at the End of the Universe ) was picked by Physics World last year as one of our top 10 books of 2013. Carroll was in the Gloucestershire town to give a one-hour talk about the Higgs, although the festival organizers were clearly working him hard as he also spoke in separate lectures on dark matter and dark energy, and on his role as a science adviser to Hollywood. (Carroll’s worked on films including Thor, Avengers Assemble and TRON: Legacy and even played a tiny role on TV’s The Big Bang Theory – stay tuned for more on that in our upcoming audio interview with him.)
By Tushna Commissariat
While the fiery shades of the image above may seem familiar to fans of the Lord of the Rings movie franchise, pictured above in exquisite clarity is a ring of dust that surrounds the near-by star HR 4796A. The young, hot star – located a scant 240 light-years from Earth – has been of significant interest to astronomers since the circumstellar ring of debris was detected, thanks to an excess of infrared emissions from the star. While there have been many other images of the HR 4796A system, this particular image has been obtained by the new Spectro-Polarimetric High-contrast Exoplanet REsearch instrument (SPHERE), which was installed in May this year on the European Southern Observatory’s Very Large Telescope (VLT) at the Paranal Observatory in Chile. Thanks to the instrument, not only is the dust-ring clearly outlined, but the glare of the bright star at the centre of the picture has been supressed. This has provided a much clearer view of the whole system, which researchers think also harbours an exoplanet or two.
By Hamish Johnston
Can you name 10 blunders that have held back the progress of modern astronomy? Avi Loeb of Harvard University can, and he lists them in an essay entitled “On the benefits of promoting diversity of ideas”, which is posted on the arXiv preprint server.
Loeb argues that a common flaw of astronomers is to believe that they know the truth even when data are scarce. This, he argues, “occasionally leads to major blunders by which the scientific community makes the wrong strategic decision in its research plans, causing unnecessary delays in finding the truth”.
The first example he gives is the 1909 pronouncement by Edward Pickering, director of the Harvard College Observatory, that telescopes had reached their optimal size and that there was no point trying to make them any bigger.
By Matin Durrani
It’s the depths of winter in Antarctica right now, but in the new issue of Physics World magazine, there’s a chance to feast your eyes on some stunning images of scientific research in the White Continent, taken a few months ago by photojournalist Enrico Sacchetti.
Sacchetti’s photographs are amazing and in the article he explains his experiences of travelling to Antarctica and taking pictures in what is one of the world’s harshest environments.
“As soon as I stepped off the C-130 [plane], the alien nature of Antarctica was truly jolting…Almost completely absent of atmospheric pollution, the air was crystal clear,” Sacchetti writes.
By Margaret Harris
When particle physicist Jon Butterworth and cosmologist Pedro Ferreira took the stage last night at the Bristol Festival of Ideas, they did so as representatives of the two pillars of modern physics. Butterworth, a leading member of the ATLAS collaboration at CERN’s Large Hadron Collider, spoke about the discovery of the Higgs boson and the effort to understand the nature of matter on the quantum level. Ferreira, a theorist at the University of Oxford, focused on Einstein’s general theory of relativity, which describes the behaviour of colossal objects such as galaxies and black holes.
The equations of quantum mechanics and general relativity are famously incompatible, but far from starting a Harry Hill-style confrontation (“FIIIIGHT!”), the advocates of the two theories shared the stage amiably, fielding questions from audience members and talking about their respective new books (Smashing Physics for Butterworth, The Perfect Theory for Ferreira). You can hear Ferreira and Butterworth’s responses to some common (and not-so-common) questions in the clips below.
By James Dacey
What does it mean to be a scientist from an ethnic minority background? Is it harder to get career breaks and to reach the top of a field? Can your background actually be a source of inspiration? Is it even useful to anyone to be discussing these questions?
These are among the issues touched upon in a new series of video interviews with 10 British scientists with minority ethnic heritage. The interviews were conducted by researchers at the British Library as part of a larger audio history project commissioned by the Royal Society called Inspiring Scientists: Diversity in British Science. You can watch all 10 interviews on the Royal Society website.