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http://habrahabr.ru/post/171273/ read it when you have time.

An interesting article; I read a similar one before, but it was much worse in Popular Mechanics. This one is more accessible and detailed.

I also really liked these 2 links:
about ribbon parasites that grow extra legs on frogs,
and especially about brain-slug fungi.
http://down-house.ru/blog/Agregor/34773-griby-parazity-i-muravi-zombi.html
This is amazing!
Parasitic fungi have turned 90% of people on Earth into zombies!!! )))
The brain of an arputra is clearly eating a toadstool )))