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Author Question: Radio waves travel at the speed of light, which is 3.00 108 m/s. How many kilometers will radio ... (Read 20 times) |
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.