If you look at a picture of the Earth from space it really is beautiful.
You don’t see the many little creatures scurrying around on its surface, pooping and having sex with each other and generally making a mess of the place.
It’s important for you to remember this the next time you look at yourself in the mirror.
Why are we telling you this?
Well, Kevin Kavanagh is Professor of Microbiology at NUI University and he has some disturbing truths for us all...