We just learned about the Primary Olfactory Cortex and a lot of things about how the human nose works.
Another part of the human body are the two Kidneys.
The kidneys are an important part of the body that helps keep the blood clean with the right amount of liquids.
When the heart is pumping blood through the body, it gets sent through the kidneys where it gets cleaned up.
(from: wikipedia - )
Kid Facts - Blast from the past: Metastasis