An infection of a parasite called Toxoplasma gondii, meanwhile, might just lead you to your death. In nature, the microbe warps rats’ brains so that they are attracted to cats, which will then offer a cosy home for it to reproduce. But humans can be infected and subjected to the same kind of mind control too: the microbe seems to make someone risky, and increases the chance they will suffer from schizophrenia or suicidal depression. Currently, around a third of British meat carries this parasite, for instance – despite the fact an infection could contribute to these mental illnesses. “We should stop this,” says Kramer

F*** that. I mean... what the hell. ONE THIRD?!?!

Our knowledge of the human “superorganism” is still in its infancy, so many of the consequences are purely theoretical at the moment. Kramer and Bressan's aim with their paper was not to give definitive answers, but to enlighten other psychologists and psychiatrists about the many entities that make us who we are today. “We cannot understand human behaviour by considering only one or the other individual,” Kramer says. “Ultimately, we must understand them all to understand how ‘we’ behave.”

And with that science takes a bold leap forward. We may be more then the sum of our parts, but understanding who we are requires understanding of all of our various 'selves.'