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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

Because the leg muscles of children with muscular dystrophy are weak, they must perform the Gowers’ Because the leg muscles of children with muscular dystrophy are weak, they must perform the Gowers’
Child with bacterial meningitis in an opisthotonic position. Child with bacterial meningitis in an opisthotonic position.
Measles. A photograph of a child stricken with measles, showing the tell-tale sign of the skin rash. Measles. A photograph of a child stricken with measles, showing the tell-tale sign of the skin rash.
Resonance transfer of energy in a light-harvesting complex Resonance transfer of energy in a light-harvesting complex
Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus
Calculation of the probabilities in a mating involving the ABO blood type Calculation of the probabilities in a mating involving the ABO blood type
Video: Stimulus (introduction)

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