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Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

The chain of infection: preventative measures follow each link of the chain. The chain of infection: preventative measures follow each link of the chain.
Spread of Infection Spread of Infection
Stages of the Infection Process Stages of the Infection Process
(a) Lymph node and (b) the palpation of cervical lymph nodes for enlargement due to infection. (a) Lymph node and (b) the palpation of cervical lymph nodes for enlargement due to infection.
Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection. Cutaneous granulomatous lesions on the face of a man suffering from a dermatophytic infection.
HIV cycle in an infected cell: (a) latent infection; (b) active infection. HIV cycle in an infected cell: (a) latent infection; (b) active infection.
Video: Cognitive development by Piaget (Preoperational stage or intelligence)

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