• Around 200,000 different species of bug, bacteria, and fungus live in your house. You may think most of them live in your toilet, but that's not true.
  • Some fungi live in your air conditioner and get blasted throughout the house.
  • One kind of mycobacteria lives in your showerhead and has been found to reduce stress and increase happiness.
  • Tens of thousands of microbe species live in your body and help keep you healthy.
  • Visit the Business Insider SA homepage for more stories.

Your home is filled with thousands of species of bug, bacteria, fungus. And while you might assume most live in your bathroom, the dirtiest place in your home isn't your toilet.

Household microbes lurk in the most unlikely of places like heat-loving bacteria called Thermus aquaticus. These guys can only be found in two environments: blisteringly-hot geysers like Old Faithful at Yellowstone, or your hot water heater.

Another example is Penicillium fungi. They creep into your air-conditioner from outdoors. When you switch on the AC, their spores get blasted around the house and are known to cause allergies in 2-6% of people. So when you notice a funny, musty smell coming from your AC, it's probably the fungus. 

Trillions of organisms live in your shower head piled on top of each other in a slimy layer half a millimeter thick.

Read also: A mysterious and deadly fungal infection is spreading across the globe, and no one knows how to stop it

But that's not necessarily a problem as researchers found that a type of shower-dwelling mycobacterium actually boosts levels of serotonin, a neurotransmitter thought to lower stress and increase happiness.

The worst is actually your own body. But it turns out, having lots of biodiversity about your person helps keep you healthy.

It's filled with dead skin cells, dust and around 200,000 different species of bug, bacteria, and fungus. But, the number of harmless microbial species in the world outnumber harmful ones by a trillion to one.

In fact, less than .00000001% of microbial species account for nearly all infectious diseases in the world.

And all these harmless bacteria crawling on your skin means less room and resources for pathogens, like antibiotic resistant microbes.

Which also means they have less opportunity to take over, and make you sick.

Also Read: I've spent nearly 300 nights in hotels and Airbnbs over the past year, and there's a small detail I check to see how clean a room is

So, even when antibiotics fail, it could be all those other microbes crawling in and on you that keep you safe.

This video was made in large part thanks to Rob Dunn, and the information in his new book, "Never Home Alone."

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