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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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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.

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There are 20 feet of blood vessels in each square inch of human skin.

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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Many salmon spawning grounds, such as the Little Qualicum River in British Columbia, consist of wate Many salmon spawning grounds, such as the Little Qualicum River in British Columbia, consist of wate
Black flies are blood-sucking insects who vector disease, like River Blindness, while feeding on hum Black flies are blood-sucking insects who vector disease, like River Blindness, while feeding on hum
Nile crocodile (Crocodylus niloticus) Nile crocodile (Crocodylus niloticus)
Chesapeake Bay: A Drowned River Valley Chesapeake Bay: A Drowned River Valley
A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia. A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia.
A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia. A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia.
Video: The Lagging Strand in DNA Replication and Replication in Action

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