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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.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Approximately 25% of all reported medication errors result from some kind of name confusion.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

Four approaches to studying the evolution of human behavior. Four approaches to studying the evolution of human behavior.
Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery Frederick Douglass, having escaped from slavery in 1836, attracted large audiences as an antislavery
Children with insecure attachments may show angry behavior with peers, which can lead to peer ... Children with insecure attachments may show angry behavior with peers, which can lead to peer ...
The “where” versus “what” and the “control of behavior” versus “conscious ... The “where” versus “what” and the “control of behavior” versus “conscious ...
Mendel’s observations about segregation and independent assortment are explained by the behavior ... Mendel’s observations about segregation and independent assortment are explained by the behavior ...
Instinctive behavior Instinctive behavior
Video: Diversity of Living Creatures - Charles Darwin & the Beagle's Voyage

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