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Did you know?
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Did you know?
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Did you know?
Cyanide works by making the human body unable to use oxygen.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
![Leukemia. A blood smear from a patient suffering from leukemia demonstrates the abundance of enlarge](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_18_46_100411265.jpeg)
![Using both hands, gently but firmly grasp the skin over a spot on the upper back, and lift the skin ...](https://biology-forums.com/gallery/32/medium_380798_22_08_17_12_32_33_328371368.jpeg)