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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

The extent of acid rain in the United States has decreased. The extent of acid rain in the United States has decreased.
The general pattern of progression of an untreated HIV infection The general pattern of progression of an untreated HIV infection
Diagram of the general anatomy of a male cat Diagram of the general anatomy of a male cat
Labeling of black cohosh: (a) front label with general health claim Labeling of black cohosh: (a) front label with general health claim
Many adults in the United States have met “heart healthy” goals for nine targeted lifestyle ... Many adults in the United States have met “heart healthy” goals for nine targeted lifestyle ...
The assembly of general transcription factors required for the initiation of transcription by RNAP I The assembly of general transcription factors required for the initiation of transcription by RNAP I
Video: Labor and Childbirth - The Three Stages of Labor: Dilation, Expulsion & Placental مراحل الولادة

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