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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
![The amount each injector is able to flow is displayed in glass cylinders are each injector for a ...](https://biology-forums.com/gallery/30/medium_548020_31_05_17_3_07_02_30071558.png)
![The relationship of substrate con- version (as measured by optical density) to the amount of patient ...](https://biology-forums.com/gallery/31/medium_398119_12_07_17_4_20_10_316061311.jpeg)