Did you know that only one in ten of the cells in your body is actually human? That's right. A whopping 90 percent of your cells are bacterial, viral, or parasitic in nature.
The NIH's Human Microbiome Project is ambitiously aiming to characterize the microbial communities living in us. And while the vast majority of these germs are symbionts, once in a while, we pick up a straggling critter that's not just along for the ride--it's there to leach our nutrients at all costs.
These parasites fall in five distinct categories, the first of which is the most numerically abundant animal on Earth: nematodes.
Check out the video above and/or click on the link below to learn more about human parasites, and leave your thoughts in the comments section at the bottom of the page. Don't be shy, talk nerdy to me!