Small One made the following announcement today:
"Empty body pirates are called GERMS."
Uh huh. When asked to elaborate, she told us it was "kinda scary, but that's ok", and explained that germs go all around inside your body to make you sick, but then the empty bodies fight them off. She then went on to say that the doctor helps you by giving you a shot FULL of empty bodies.
Ahhhh, it's becoming clear to me now! Antibodies! And yeah, germs are sort of like pirates, aren't they?