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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
![Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_14_26_100251196.jpeg)
![Scaling the Earth down to the size of a basketball, the Moon is roughly the size of a tennis ball. T](https://biology-forums.com/gallery/47/medium_12359_23_01_13_7_13_34.png)