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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
There are more sensory neurons in the tongue than in any other part of the body.
![Walk around the head of the table to the left side and reach across to perform threecount stroking ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_12_54_25_33054938.jpeg)
![Standing at the head of the table, apply oil or lotion to the entire back with bilateral stroking. ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_43_18_331731783.jpeg)