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Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Amsterdam Albatross - Adult in flight, showing dark plumage typical of the species. Amsterdam Albatross - Adult in flight, showing dark plumage typical of the species.
Chimpanzees live in complex kin groups in which lifelong bonds and individual personalities play key Chimpanzees live in complex kin groups in which lifelong bonds and individual personalities play key
Compared to a chimpanzee, the human newborn has relatively little room to spare as it passes through Compared to a chimpanzee, the human newborn has relatively little room to spare as it passes through
Structures of the human myelencephalon (medulla) and metencephalon. Structures of the human myelencephalon (medulla) and metencephalon.
Plot showing the number of genes on each human chromosome Plot showing the number of genes on each human chromosome
G-banded karyotype of a normal human male G-banded karyotype of a normal human male
Video: Spermatogenesis Animation

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