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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
The average adult has about 21 square feet of skin.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
![Leafcutter ants carrying leaf fragments back to the nest where they will be processed to create a su](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_15_38_1724111.jpeg)
![Formation of an atherosclerotic plaque within a coronary artery; may lead to coronary artery disease](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_23_55_85281061.jpeg)