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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).
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.