|
|
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
People about to have surgery must tell their health care providers about all supplements they take.
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).
![Older adults may grieve intensely over the loss of a person or situation that has been a part of the](https://biology-forums.com/gallery/47/medium_18099_25_09_12_12_17_57.jpeg)
![Emanuel Leutze’s Washington Crossing the Delaware (1851) is riddled with historical inaccuracies, mo](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_46_08_22243215.jpeg)