|
|
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.
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.
Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.
![Old-growth redwood forest in western North America. Redwoods are the tallest trees in the world, wit](https://biology-forums.com/gallery/47/medium_33_28_08_11_12_01_59_15502383.jpeg)
![Chinese workers on a railway in the far West. “Without them,” Leland Stanford, president of the Cent](https://biology-forums.com/gallery/47/medium_376063_22_08_15_11_31_02_223711629.jpeg)