|
|
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
![USF Biologist Taegan McMahon conducts experiments on chlorothalonil at a research facility in East H](https://biology-forums.com/gallery/47/medium_12359_16_05_12_9_06_07.jpeg)
![The electrophoretic mobility of a protein on an SDS polyacrylamide gel is related to its molecular w](https://biology-forums.com/gallery/47/medium_9828_12_01_13_10_05_23.jpeg)