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Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Did you know?
If you could remove all of your skin, it would weigh up to 5 pounds.
![Two important changes occur in the upper airway in croup:The epiglottis swells, thereby occluding th](https://biology-forums.com/gallery/47/medium_14755_05_10_12_4_11_17_92641447.jpeg)
![A passenger train crosses Stony Creek Bridge in the Rocky Mountains in 1878. Railroads were importan](https://biology-forums.com/gallery/47/medium_27_24_08_15_1_27_03_22389406.jpeg)