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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Body plan of an arthropod, as represented by a grasshopper Body plan of an arthropod, as represented by a grasshopper
Body plan of an echinoderm, as represented by a sea star. Body plan of an echinoderm, as represented by a sea star.
The Scopes Trial: William Jennings Bryan (right) represented the state of Tennessee, and Clarence Da The Scopes Trial: William Jennings Bryan (right) represented the state of Tennessee, and Clarence Da
The principle of faunal succession uses animal fossils to tell relative time. The principle of faunal succession uses animal fossils to tell relative time.
Gestalt Principle: Proximity Gestalt Principle: Proximity
Because the factor h on the right side of the Heisenberg uncertainty principle has units of ... Because the factor h on the right side of the Heisenberg uncertainty principle has units of ...
Video: Gastroesophageal Reflux Disease (GERD)

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