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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

The geological timescale and an overview of the history of life on Earth The geological timescale and an overview of the history of life on Earth
Diagram of the life cycle of Plasmodium falciparum, the causative agent of malaria Diagram of the life cycle of Plasmodium falciparum, the causative agent of malaria
The life history of T cells The life history of T cells
Dimensions of quality of life affected by cancer Dimensions of quality of life affected by cancer
Gossip and ridicule increase the status insecurity of this time of life. Gossip and ridicule increase the status insecurity of this time of life.
Life cycle of a club fungus having two mating strains of hyphae Life cycle of a club fungus having two mating strains of hyphae
Video: Virtual Tour of the Eye Animation

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