Life on Us a

Where the first part of the series lets us down is its failure to deliver Australian science. Most of the science highlighted is being done overseas, while the commentary and human interest stories are of Australian origin. Fortunately, a sneak peek at the second part of the series promises a much stronger showing for Australian science.

Many of the protective species of bacteria on the human body do their job by competing for living space with invading bacteria. Since the good bacteria were here first, they have an advantage and they are able to push the invading bacteria out.

Scientists can take a simple swab and quickly build up aprofilefor the sort of bacteria to which youve been exposed. As they build up profiles frommany people, it becomes possible to tell the difference between good and bad bacteria. Your belly button bacteria can then help predict which diseases you might get and, if you do get one, how easily you may fight it off.

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I personally was interested in how gut bacteria colonise the vagina prior to birth. These bacteria form the basis for the infants own gut flora. However, this event was taken care of with a ten-second animation showing descending sparkles in the area of interest. When I looked further into the topic, it seemed clear that in some cases these colonising bacteria arenot helpful a point missed by the documentary.

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Another shortcoming of this documentary is in the lack of depth and scientific rigour to which some of the facts are subjected. This can be forgiven in a documentary targeted at the general public. Nonetheless, it would have been nice to go into more detail and to give the pubic a sense of how well established some of the facts are.

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A persons belly button contains hundreds of bacterial species. The belly button is rarely well-washed and is a cosy place for these bacteria to settle. The bacteria here are probably not critical to our existence, but their presence does provide a quick and easy way to sample the great variety of bacteria living on the rest of human body.

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Its important to appreciate that the scientific method produces advances that are not always grand leaps forward. Advances can come in fits and starts, with sometimes fierce debate in-between. The documentary is a good one, but as is often the case, there is more focus on the grand leaps, and less on the nitty-gritty of science.

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For the most part, this documentary delivers what is promised. It has beautiful (and sometimes gruesome) graphics showing what our bugs are up to. And there is a wide-range of interesting findings some of which are sure to surprise even experts.

The story of the human louse and its various specialities is also a good one and is examined with stunning new electron microscopy videos. It is an evolutionary tale that explores how lice migrated across the body during our hairier past. It explains how they had to specialise to live in different environments as we became less hairy, as head lice cant survive on any other part of the body.

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In the case of skin, those bacteria on the surface jealously guard their home and invading bacteria find it difficult to find nutrients and space to grow. Invading bacteria can also be attacked by existing bacteria using chemical warfare.

A new two-part SBS documentaryLife on Uslooks at the bugs that make our body their home, using new tools to visualise these microscopic creatures. The first one-hour episode airs on SBS One at 8:30pm on Sunday, April 27.

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Bugs affect us in a variety of ways: some bad, such as infections, but many good. From the passing of helpful bacteria from mother to baby, to the defence of our skin and intestine from disease-causing bacteria, our resident bugs are with us throughout the course of our lives.

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The two-part series is a co-production betweenAustraliaandFrance, with the Aussie trailer heavy on monsters and dramatic music and the French version heavy on lingering shots of human bodies.

Many microscopic bugs and bacteria live on our skin and within our various nooks and crannies. Almost anywhere on (or even within) the human body can be home to these enterprising bugs.

Two of the main stories in the first episode focus on belly button bacteria and on the many varieties of lice.

Unfortunately, as the documentary points out, once your skin is broken these invaders can get inside easily. Often this causes a local infection, but sometimes it causes problems throughout your body.

Bugs can also affect how we think. Among the fascinating tit-bits is the story oftoxoplasmosisand risk-taking behaviour. Toxoplasmosis is an infection commonly picked up from cat poo that can cause serious harm to pregnant woman or other people with a weakened immune system.

In rats or mice, this infection is associated with behaviour that makes it more likely that theyll be caught by a cat. In humans, it was associated with anincreased likelihoodof putting themselves in a risky situation.

These invaders might be bad bacteria like those responsible for food poisoning. Or it may be good bacteria such as those found inyogurt. In either case, the invaders are at a distinct disadvantage.

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Paul Bertrand receives funding from National Health and Medical Research Council for projects relating to gastrointestinal health and disease.

Life on Usairs on SBS One at 8:30pm on Sunday, April 27.

RMIT UniversityandVictoria State Governmentprovide funding as strategic partners of The Conversation AU.

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I was also interested in the role of toxoplasmosis in human behaviour. However, the story of itstentative links with psychiatric diseasewas not discussed. The controversy and complexity around this topic could have provided more insight into the scientific method.

The documentary links our loss of hair (to get rid of these parasites) with the lighter coloured skin of cooler climate people. It even looks at why we have some lice that came from ournearest simian neighbours in this case, there must have been some close physical contact. Despite some aspersions cast on our early ancestors, this makes for a complex and interesting tale.

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