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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Fossil from the Carboniferous period Fossil from the Carboniferous period
Exploring the functional activity of brain regions by using fMRI scans. Exploring the functional activity of brain regions by using fMRI scans.
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Schematic depiction of the action of tryptophan synthase in one functional unit Schematic depiction of the action of tryptophan synthase in one functional unit
Elizabeth, a married 35-year-old woman, always thought that she followed a sensible diet Elizabeth, a married 35-year-old woman, always thought that she followed a sensible diet
During a period of high power demand, the voltage output of the power company is reduced by ... During a period of high power demand, the voltage output of the power company is reduced by ...
Video: Stroke volume

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