|
|
About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
![Vision with macular degeneration is experienced with an inability to focus in the center of the visu](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_36_56_939795.jpeg)
![Abundant cave art after about 30,000 years ago is evidence of the importance of symbolic behavior fo](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_03_15_208321215.jpeg)