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Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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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.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Foliage height diversity and bird species diversity (data from MacArthur and MacArthur 1961). Foliage height diversity and bird species diversity (data from MacArthur and MacArthur 1961).
The carbon cycle. Numbers are storage as 1015 g or fluxes as 1015 g per year (data from Schlesinger The carbon cycle. Numbers are storage as 1015 g or fluxes as 1015 g per year (data from Schlesinger
A Bobcat on the Calero Creek Trail, in San Jose, California. A Bobcat on the Calero Creek Trail, in San Jose, California.
How to sketch a graph of a function using calculus only (Part 3) How to sketch a graph of a function using calculus only (Part 3)
How to expand a polynomial (Part 1) How to expand a polynomial (Part 1)
Transcription of a gene (Part 2) Transcription of a gene (Part 2)
Video: Polymerase chain reaction PCR - Animation

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