Friday, 23 January 2015

An Ode to Beagle 2





As I'm sure most people reading this will be aware, the ill-fated Beagle 2 mission to Mars is believed to have been located, just 5 km from its intended landing site. The Guardian has the full story but rather than repeat what many others have said I would rather present the poem I heard on the Shaun Keaveny show this morning on 6 Music.
  The poem is by Murray Lachlan Young who is a regular on Shaun's show and has some great poems and ditties on all sorts of subjects. I've transcribed the poem below (and hope this doesn't contravene any kinds of copyright or anything) so I take responsibility for any errors I've made in the words or meter of the poem. To hear the poem read by Murray himself (who has the kind of voice perfectly suited to reading poetry aloud) then go here. He has several other clips stored on the BBC site here and you can read lots more of his poetry and find more out about him here.

Murray Lachlan Young

Ah, Beagle 2, oh there you are
Sitting nice and quietly
Upon the cold red planet's skin
So British in your modesty

Your legend was receding fast
Your memory half-blown away
Just like our dreams

Twelve years ago as we assembled Christmas Day
To watch the Cool Brittania lander
Softly touch down Britain first with coloured dots to calibrate
Designed by Damian Hirst but

Christmas day it came and went, then months, then years
A decade on you sadly came to represent
Embarrassments of things gone wrong
A name upon the missing list made by those not up to the task

Dreamed up by some eccentric Brit whose reach outran his dizzy grasp
Whilst NASA champagne corks went pop you roamed with Curiosity
Your fate it seemed was destined to remain a Martian mystery

Great Britain, put aside its spacesuit
Packed its trunk and walked away until quite out of the blue
Upon one January day, a photograph of you, yes you

A tiny shiny Beagle dot, snapped from the NASA orbiter
Chillaxing on the very spot that Colin Pillinger intended all those moons ago.

So elegantly vindicating all we thought we ought to know
Yes boffin-built lightweight and groovy

Nano-budget to concur
A callsign raised and written by those lovely boys from Blur

But why we ask were you so silent?
Making things so bittersweet
Perhaps it was too beautiful for you to feel the need to speak?
But there you sit and there you are
Upon the skin of planet Mars and maybe
We may once again begin to reach out for the stars

Friday, 16 January 2015

The Blind Leading the Blind


If you listened to the recent podcast 'Serial' you probably heard 'This American Life' mentioned with every episode, it's a fantastic radioshow and podcast that never fails to provide new perspectives on everyday stories and you should give it a try, whether you're American or not. I caught an amazing episode of TAL earlier this week, actually a re-broadcast of a new radio show Invisibilia, hosted by Alix Spiegel of NPR and Lulu Miller who comes from another great podcast, Radiolab.
  The gist of the show was that the way we approach things, experiments, (dare I say life itself?) may affect what then happens. In the terms of the show, how our expectations of a particular result can bring about that exact result. While there's a danger here of veering into psuedo-science, I don't think there's anything superficially shocking here. The primary example from TAL was of an archetypal rat/maze experiment in which the rats had signs placed on their cages labelling them as 'smart' or 'dumb'. Lo and behold, when the rats were run through the mazes the 'smart' rats performed amazingly while the 'dumb' rats performed poorly. The twist here is that the rats were all just normal rats, any intellectual abilities they may have had were unknown and so identifying them as smart or otherwise almost certainly came down simply to the prejudices of the people involved in the experiment.
  I wrote that this wasn't particularly shocking to me, what I initially thought was simply that the experimenters were using their judgement in some way, allowing the 'smart' rats to achieve higher scores than the 'dumb' rats by subtle differences in the way that information was recorded. The truth is a little more depressing than that it turns out. What actually happens is that the experimenters are nicer to the smart rats, handling them more gently and so on. This actually has a large effect on the rats performance, (I'm guessing) largely due to stress levels and the extra attention given to the smart rats. Thus are the results explained, although the idea that people are meaner to dumb rats than smart rats confuses and upsets me.

  Taking this idea forward, the life of Daniel Kish is explored, or at least, his life as it relates to being blind and being an echolocator. There is a lot written about Daniel in various places so I don't really feel the need to repeat it in much detail, if you want a bit more than I'm offering here, listen to the podcast, watch this short video, read this interview or check out his wikipedia page.

  The headline grabbing bit about Daniel is that he rides a bike, occasionally during rush hour, while blind. Having lost both of his eyes before the age of two, he has little choice really apart from possibly, you know, not riding a bike at all. Although, if you were to hear Daniel speak you would realise that this is not a choice at all. Having learned to navigate his way around the world using echoes from clicks he creates with his mouth, Daniel creates mental representations of the world in his visual cortex. The visual cortex has previously been supposed to be all but silent for blind people, at least until people actually started to look at it. However, experiments using the magic fMRI machine show that blind people who use this kind of echolocation have precisely the same areas of the visual cortex light up when presented with various representations (salad bowl, moving salad bowl, wall, etc) as a sighted person does.
  The conclusion of Dr. Lore Thaler is that blind people who can echolocate have a 'vision' roughly equivalent to a normally sighted person's peripheral vision. Something akin to a person attempting to navigate whilst looking down at their hands (I'll stop short of comparing a blind person's navigational skills to those of someone who is texting, as the blind person is probably devoting their entire attention to the navigation, whereas the texter is not).

  What really struck home for me about this whole story is that Daniel Kish developed his skills and now lives a happier, more independent life simply because his parents (well, parent, you'll have to listen to the podcast really) refused to wrap him in cotton. His mother didn't give him his independence exactly, but she refused to crush it. When Daniel's school told her to curtail his clicking because it was 'socially inappropriate', she refused. When friends, family and concerned neighbours told her to stop him riding bikes, she bought him a new one for Christmas. I will now write that horrible phrase which will remove any credibility but as a parent the thought of my child losing his eyes fills me with dread and I can only imagine that the temptation to coddle him for the rest of his life was extremely strong. Fighting this temptation is the knowledge that allowing your child to discover the world in his or her own way is the only way that they will truly find their own way around it.

 Another amazing aspect of this whole story is that apparently blind children often develop this clicking or another form of echolocation as a means of navigation. What is awful is the thought that this ability might be taken away from them simply on the grounds that they are not behaving as we expect them to. It is Daniel's opinion (amongst others) that it is expectations like this which create helpless blind people, in no way is it the blindness itself. Despite his initial (and ongoing) reluctance, Daniel now runs the non-profit World Access for the Blind in order that he can help others develop the skills which he uses to navigate the world. I should point out that he finds nothing remarkable whatsoever in his ability to ride a bike through traffic. He detests being the 'blind guy on a bike', as if he is a sideshow act. If more people can take on board what he has to say then perhaps we could all learn to see things his way too.

Friday, 9 January 2015

Seals as Probes - Revisited

As per my last post, I was very happy that Chris Benjamin wrote up a considerably better researched version of my very first blog post for Science Friday last year regarding the use of seals in climate and weather monitoring/research. As I recently was able to attend a seminar on the updated results from the seal project I thought this would be a good opportunity to explore the subject a little further.

  Something that was perhaps missing from my original post is the importance of monitoring ocean conditions. Ocean observations are very important in terms of measuring their heat uptake. According to the IPCC Assessment Report 5 the top 700m of the oceans take up 93% of global warming heat content (see below).
 
Given this, you can perhaps see why it might be interesting (and important) to study the Antarctic circumpolar current (ACC). This is the most important current in the Southern Ocean and the only current that flows completely around the globe. Incidentally, it was discovered by Edmund Halley, the British astronomer (who says astronomers have no real-world use?). The ACC is equivalent in flow to all of the rivers in world combined (Chidichimo et al, 2014).

Measuring the temperature and salinity of the water in the ACC, in addition to other, less well-travelled water has become easier and more widespread with the ARGO float system. However, in order to take the same measurements beneath the variable sea ice which extends beyond the land it is necessary to recruit the services of seals, as covered by myself and Chris Benjamin.

The seal measurements allow forecasts to be made for the Antarctic area, this is particularly useful for military pilots who, under certain circumstances, must where survival 'dry suits' when flying. These suits are very uncomfortable, particularly in cramped cockpits and so knowing whether or not they are necessary is useful information for the pilots!

Mapping ocean currents, particularly in a predictive sense, can be immensely useful in a 'man overboard' search and rescue mission. The disappearance of flight MH370 last year is another example of the importance of this information.

The measurements made by the seals, or rather by the instruments attached to the seals, are made on the upward portion of the seals foraging dives. The data loggers consist of a pressure sensor (in addition to other sensors) which is on constantly, this notes when seals begin to ascend from their dive and alerts the other sensors to turn on and begin measurements. The record dive of an Elephant seal is over 2000 metres, over four times the average of 500 metres. It's not really understood how such deep dives are possible, although the seals have ribs made of cartilage which means that they can collapse their chests, the impact on the seals' blood chemistry is still very significant.

Dive profiles consist of seventeen points which are split into four messages, the transmission of which is attempted when the seal surfaces. A minimum of 160 seconds is needed to send these four messages via the Argos satellite tracking system, unfortunately the mean elephant seal surface period only lasts for 130 seconds, meaning that transmissions are often incomplete, resulting in poor positional information and/or incomplete profiles of the water temperature and salinity. An alternative to transmit the messages via the Iridium satellite constellation exists but depletes the data logger batteries at an increased rate.

  By running reanalysis experiments of past weather conditions the usefulness of the seal observations can be evaluated. It turns out that incorporating the temperature and salinity measurements tends to lead to an overestimation of the water salinity. This is difficult to verify without independent observations (of which there are none) but in the Kerguelen region where there is some overlap between ARGO floats and seal data it was found that the ARGO floats had the opposite bias - where the sea measured fresher than predicted by the ocean model.

  It is notable that the primary difference in instrumentation between the floats and the seal data loggers is that the former use capacitance to measure salinity while the latter use inductive conductivity sensors. The seal sensors are found to have a high bias (as seen) when the sensor is close to any surface (like a seal for example...). This effect can be accounted for by calibrating the sensor for each individual seal, unfortunately this requires a long data baseline of around a year. At which time the sensors are falling off the seals in any case!

  All this means that the salinity profiles obtained from the seals are partially useful for research purposes but can't really be used for meteorological forecasting.

  What is lucky is that even incorporating only the temperature profiles from the seals data loggers results in a significant improvement for temperature and salinity forecasts, as well as improvements in estimates of global temperatures, extending far beyond the regions sampled by the seals.

It has been noticed that the location and strength of ocean fronts are impacted in models by the seal-measured temperature. However, without good quality independent observations it is difficult to assess whether this is a beneficial change or not.

Monday, 8 December 2014

Seal Blog makes it to Science Friday!

So, after I wrote my first ever post on this blog (Resistance is Futile), my friend Chris Benjamin picked up on the story and asked for contacts to follow up for a potential Science Friday article. That article has now been published and is available here!

Tuesday, 14 October 2014

Ada Lovelace Day Blog! Sophie Germain



Today is Ada Lovelace Day (much info and other stuff at findingada.com), an international celebration of the achievements of women in science, technology, engineering and maths (STEM). As I'm a fan of Ada Lovelace (particularly as told in steampunk style!)(http://sydneypadua.com/2dgoggles/lovelace-the-origin-2/) I thought I'd like to join in the event and write about a woman in STEM that I personally have found inspiring.

  Normally, if I was trying to write about an interesting, inspiring woman in STEM, I would probably have gone straight for Ada Lovelace. That seemed a bit 'on-the-nose' for Ada Lovelace Day though, so instead, I'm going to write about Sophie Germain.

  I first read about Sophie in the book 'Fermat's Last Theorem' by Simon Singh, in which the work she did towards the theorem is highlighted. I later was reminded of her through some lines in a play I was in, 'Proof', in which she was used as an example of how you just can't keep a good mathematician (a woman one at that!) down.

  The basic details of Sophie Germain's life are fairly well reported - she was part of a family pretty low down in the bourgeoisie stratum. They were, however, of sufficient standing that, come the French Revolution, Sophie was largely confined to the house in order to avoid the chaos that ruled the streets. She used this time to study the books on mathematics in her father's library, going well beyond what I might consider a 'casual interest', reportedly teaching herself Greek and Latin so that she might be able to read the works of Newton and Euler. If Sophie had made no further progress than this she would still be utterly remarkable, Newton's Principia Mathematica is not exactly an easy read, even in English.
  Supposedly Sophie was drawn to mathematics by an apocryphal story of how Archimedes was slain by a Roman soldier while distracted by a mathematical diagram, thinking that something that can cause someone to ignore a man with a sword must be pretty interesting! She went on to become immersed in mathematics, using lecture notes from the École Polytechnique which she was either allowed or begged, borrowed or stole from students. She herself was denied entry on the basis that she was, you know, a woman. Later, she assumed the identity of a male student and began sending her work to Lagrange, a faculty member. The story of her later meeting with Lagrange, his support of her and how she developed mathematics and earned the respect of (some of) her mathematical peers is well documented.

Rather than repeat the facts of Sophie's life which are well explored elsewhere, I'd like to write about why I find her interesting and inspiring.
  Firstly, she's interesting because reading about her is like reading a who's who of mathematics. Looking around different sites about her brings up the names Lagrange, Gauss, Legendre, Navier, Poisson and Laplace. These names would be familiar to anyone with a career or extensive education spent in the mathematical and physical sciences and some of them would be likely candidates for this blog post if I were instead writing about inspiring men in STEM. I love the way that the theorems and mathematical devices that I've used in my work become part of a larger world of actual people when you start to see the links between someone like Gauss and someone like Sophie. These were living, breathing people with feelings, ideas and politics and that is all too rarely remembered.
  Secondly, I find Sophie's life inspiring because she wasn't normal. The truth is that I would likely never have heard of Sophie if she had been a man, her accomplishments were in fields that I have never had much interest in. What has really brought Sophie to the attention of most people, including myself, is the story behind her work. The struggles that she went through to be able to be a 'mathematicienne', her subterfuge in pretending to be male in order to converse with Lagrange and Gauss and her battles against a hierarchy determined to ignore her.

It is quite possible that, had Sophie been a man, I would never have heard of her. However, the truth is that Sophie Germain is a difficult person to play 'what if' with. No doubt, if a man had produced the work she had, this would be just as important for people in those fields. However, for those of us outside of those fields, we probably would never have come across it. A young man would likely have been encouraged in their pursuit of mathematics, instead of denied candlelight and bedding to try and crush the love of the subject, as Sophie was. A man would have been able to attend the École Polytechnique, had tutors and opportunities to work alongside other mathematicians.
  Had Sophie been given these opportunities, she would have been taught in much the same way that others were taught at the time and that is what makes the hypothetical 'male Sophie' so hard to imagine. One of the main criticisms of her work was that it lacked rigour. No doubt this rigour would have been taught to her had she been taught in the traditional fashion. At the same time, it is possible that this may have driven some of the fascination from her or robbed her of the originality that her work had (for example, the work that she eventually won the prize for).

 Her work was important because of the insight that she had and I doubt that this would have been easily removed simply by a more traditional education. In fact, I expect that the truth is more likely that society has been denied the even greater work and insights that Sophie might have had if she had simply been encouraged to reach her full potential. Louis Bucciarelli and Nancy Dworsky, who were biographers of Germain's, wrote 'All the evidence argues that Sophie Germain had a mathematical brilliance that never reached fruition due to a lack of rigorous training available only to men.'

  While Sophie Germain struggled to find recognition in a field of work which she was truly passionate about and then died at a young age from breast cancer, she was fortunate in other ways. Her father was wealthy enough that she was supported by him throughout her adult life. In fact, if it had not been for a somewhat privileged background, Sophie would never had access to the materials and opportunities that inspired her in the first place. While we can at least recognise today that society suffers when people are denied opportunities based on gender, we still have a long way to go before we can hope for anything approaching real equality. I hope that Ada Lovelace Day will inspire young girls and women to see the potential and enjoyment in the STEM subjects. At the same time, I hope that one day we will actually provide the resources and true opportunity for everybody who is inspired by people like Sophie Germain, male, female or trans, rich, poor or underprivileged.

  Finally, while reading around for material for this blog, I found this amazing quote from a textbook that I struggle to believe even existed. At the time that Sophie Germain was working, women were not expected to be completely ignorant of mathematics. In fact, they were encouraged to know a little so that they could discuss the topic, should it come up in dinner conversation or wherever. To this end, Francesco Algarotti wrote 'Sir Isaac Newton's Philosophy Explain'd for the Use of Ladies'. This book attempted to explain the Principia through a romantic (naturally) relationship, describing the inverse square law of gravitational attraction thus - "I cannot help thinking ... that this proportion in the squares of the distances of places ... is observed even in love. Thus after eight days absence, love becomes 64 time less than it was the first day."
  I wonder whether Sophie Germain found this interpretation any less bewildering than the Latin she read it in?

Wednesday, 24 September 2014

India's Mars Mission Envy


India's Mangalyaan (Mars Craft) spaceship and its successful insertion into Mars' orbit is exciting on so many fronts. What I'm most excited about is that one of its instruments is searching for methane. The Mars Express mission detected raised levels of the molecule way back in 2004. This discovery was heralded as being a possible indicator of microbial life on Mars, or maybe the marker of geological activity on the planet (admittedly less exciting but not a bad consolation prize!). While the NASA Maven mission entered Mars orbit rather more quietly a few days ago it has mission objectives focussed elsewhere, on the passing of a nearby comet and then the upper atmosphere of Mars. I can't seem to find a way of constructing a sentence about the Maven mission that doesn't seem patronising or dismissive but the truth is that I'm more excited by far about India's mission. Not only am I looking forward to the methane detection experiment results, this is a great accomplishment for India.

I haven't read a single news article yet that hasn't drawn attention to the notion that India would have been better off redistributing the $75 million it spent on the mission (around a tenth of what the Maven mission cost!) on feeding and clothing hungry citizens. There are even snarky digs at the fact that the country receives aid while having the audacity to perform science. This seems to me to completely miss the point. India has pulled off a fantastic feat of engineering here, for a bargain no less! How can this possibly be anything other than good for their economy and standing in the world? If we are worried about the poverty in the country then surely it is more helpful to improve the industry, infrastructure and reputation of the country. The Mangalyaan mission will do all of those things, even if indirectly. The western world has been driving for years towards the notion that science must always be directly practical in its application, otherwise it is somehow unworthy and wasteful. I'm glad that India at least can overcome this lack of vision and I hope that they, as a country, can make great accomplishments in areas where we must now rely on private citizens and companies.