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Everyone has one nostril that is larger than the other.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

(a) Yucca baccata in full flower; (b) a Yucca moth, Tegeticula planella, ovipositing on a Yucca flow (a) Yucca baccata in full flower; (b) a Yucca moth, Tegeticula planella, ovipositing on a Yucca flow
Some playgrounds near streets with heavy traffic may still have high levels of lead from gasoline ... Some playgrounds near streets with heavy traffic may still have high levels of lead from gasoline ...
Blood flow through the heart. Blood flow through the heart.
Peak flow meter. Peak flow meter.
3-month-old baby in one of Rovee-Collier's memory experiments 3-month-old baby in one of Rovee-Collier's memory experiments
graphic(04-40.jpg) Mary pushes horizontally on a large, heavy table which is s graphic(04-40.jpg) Mary pushes horizontally on a large, heavy table which is s
Video: Structures that affect circulation - arterioles and vasomotor responses

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