We’re Not Alone

The Secret, Trillion Lives
Crawling In & On Your Body

The late Carl Sagan may have said, we’re all made of starstuff. But deep down, what we really are is a multitude of microorganisms, 100 trillion of them, some part of our natural physiology, but most totally foreign. We wouldn’t have lasted this long on Earth without them.
While cells are the bricks that form our bodies, even before birth, an ever growing, self-renewing, array of microscopic creatures call us their home and, gasp, may also call the shots about everything we think we are, from how healthy or moody, to when we’ll finally expire.
So much for freewill. This invisible trillionaire community, living off our so well washed and fed bodies, shelters charitable organisms which allow us to survive what would’ve killed us in the past, and downright lethal pathogens for which there’s no defense. And yet others are content to just control whoever we follow on Twitter.
To learn about these entities, simple but formidable enough to erase a city’s population, is to find multiple new questions to every doubt we may clarify. It’s also to wonder how come a brainless, single-cell being can play such a complex role in the evolutionary ladder.
Notice that we hadn’t mentioned viruses till now; we figure too few would that eager to hear about them once more. But if bacteria can be foreign to us, viruses are totally aliens as they have no cell or internal structure. All killing’s done with the thinnest protein layer and a string of nucleic acid. We’d let those dogs lie for now, if we could.
Bacteria, however, can actually be our allies, and our guts hold enough of them to actually defeat an alien invasion, as H.G. Wells‘ illustrated so well in War of the Worlds. Not for long, though, as we overuse antibiotics, which kill both good and bad ones, and give rise to a new breed of superbugs. Watch out.

MAFIA BUGS & ZOMBIE SPIDERS
Speaking of evolution, a step above, more complex and considerably larger, are parasites, which are tiny insects, still invisible to our poor eye sights, but very capable all the same. Nature is full of them, and now we’re also learning that some can be pretty clever, controlling bigger creatures. Including us.
There’s one, for instance, that once inside a bumblebee, can force it to become food for its larvae, not before digging its own grave, though. They called it a Mafia Bug, but you haven’t heard it from us. Curiously, such approach to domination is emulated by other, larger creatures, such as some kind of wasps.
The Pompiliadae, a.k.a. Spider Wasp, is so called for a reason: it poisons and paralyzes without killing a spider, drags it to its burrow, bury it, and lay eggs on top of it, so it will be eaten still alive by its larvae. Pretty horrific. Another wasp does something similar: it turns the spider into a zombie construction worker.
Well, you may say, at least it teaches it a marketable skill. Except that it also paralyzes the spider and lays its eggs, etc. Not a fate one would think dignified enough for anyone, but, gasp again, it may be already happening. And your favorite pet may have something to do with some of your dark thoughts.

IT COMES FROM INSIDE YOUR CAT
Research is not new, but it goes along with the same M.O. displayed by the parasites we’ve mentioned, except that this time, the joke, er, the zombies may be us. The Toxoplasma gondii infects domestic cats via their food, and can manipulate certain cells to gain access to the central nervous system of a human.
Since the protozoan can live in many environments but survives only in the guts of cats, evolution may have given it a surprising edge. It’s been proven, for instance, that once it’s present (more)

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