|
|
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
There are 60,000 miles of blood vessels in every adult human.
Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
![An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution](https://biology-forums.com/gallery/47/medium_12359_07_10_12_6_15_48.png)
![Retinopathy. Illustration of a normal retina (left) and a diseased retina (right). The diseased reti](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_36_56_93981716.jpeg)
![L. Frank Baum, author of The Wonderful Wizard of Oz (1900) and a fan of William Jennings Bryan, perh](https://biology-forums.com/gallery/47/medium_376716_26_08_15_11_16_37_22450198.jpeg)