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Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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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).

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Classification of bones by shape. Classification of bones by shape.
The bones of the skeleton. The skeleton, anterior view. The bones of the skeleton. The skeleton, anterior view.
Bones of the upper extremity. Bones of the upper extremity.
Lacrimal bones Lacrimal bones
Bones of the lower extremities. Bones of the lower extremities.
Mobilize the ankle. Place the heels of the hands just below the ankle bones, with fingers pointing ... Mobilize the ankle. Place the heels of the hands just below the ankle bones, with fingers pointing ...
Video: Semidiscontinuous DNA replication

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