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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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There are 60,000 miles of blood vessels in every adult human.

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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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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
The Border Collie is considered to be one of the most intelligent breeds. The Border Collie is considered to be one of the most intelligent breeds.
Border Collie Border Collie
Major moons of Uranus in order of increasing distance (left to right), at their proper relative size Major moons of Uranus in order of increasing distance (left to right), at their proper relative size
Rank-order correlations show that differential consistency remains high from childhood through late ... Rank-order correlations show that differential consistency remains high from childhood through late ...
Running is a great way to improve cardiorespiratory endurance Running is a great way to improve cardiorespiratory endurance
Video: Reflex arc construction

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