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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Paranasal sinuses are part of the upper respiratory system. Paranasal sinuses are part of the upper respiratory system.
(A) Dornier Compact Delta® lithotripsy system. Acoustic shock waves generated by the shock-wave-gene (A) Dornier Compact Delta® lithotripsy system. Acoustic shock waves generated by the shock-wave-gene
Urinary system Urinary system
lymphatic system lymphatic system
Pathways of the Auditory System Pathways of the Auditory System
The experimental system that permits observation of rotation in the F1 component of F1F0 ATP (b) The experimental system that permits observation of rotation in the F1 component of F1F0 ATP (b)
Video: What is Reverse Osmosis?

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