Hi everyone,
Here is a BBC article about different cells and organisms inside us.
http://www.bbc.com/future/story/20150917-is-another-human-living-inside-you*****************************************************************************
Once upon a time, your origins were easy to understand. Your dad met your mum, they had some fun, and from a tiny fertilised egg you emerged kicking and screaming into the world. You are half your mum, half your dad – and 100% yourself.
Except, that simple tale has now become a lot more complicated. Besides your genes from parents, you are a mosaic of viruses, bacteria – and potentially, other humans. Indeed, if you are a twin, you are particularly likely to be carrying bits of your sibling within your body and brain. Stranger still, they may be influencing how you act.
“Humans are not unitary individuals but superorganisms,” says Peter Kramer at the University of Padua. “A very large number of different human and non-human individuals are all incessantly struggling inside us for control.” Together with Paola Bressan, he recently wrote a paper in the journal Perspectives in Psychological Science, calling for psychologists and psychiatrists to appreciate the ways this may influence our behaviour.
Microbes in your gut can produce neurotransmitters that alter your mood; some scientists have even proposed that the microbes may sway your appetite, so that you crave their favourite food.
In this light, it becomes clear that our actions are not entirely our own. It’s enough to make you question your sense of identity, but the idea of infiltration becomes even more eerie when you realise that your brain has not just been invaded by tiny microbes – but also by other human beings.
They are, in other words, a chimera – a fusion of two bodies – and it may occur in many organs, including the brain.
In general, however, we shouldn’t feel hostile towards these invaders – after all, they made you who you are today.
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Cheers.
Sriram