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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
![(A) Lymphatic vessel with valves within tissue cells; (B) photomicrograph of lymphatic vessel with v](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_17_45_85041332.jpeg)
![Major moons of Uranus in order of increasing distance (left to right), at their proper relative size](https://biology-forums.com/gallery/47/medium_12359_13_01_13_4_50_58.jpeg)