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In 1864, the first barbiturate (barbituric acid) was synthesized.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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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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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.
How to find the derivatives of trigonometric functions using the chain rule (Part 1)
How to find the derivative of a function when the base and exponent contain a variable x^x
How to use L'Hospital's Rule to find the limit of a function (Part 2)
Eutrophication "الإثراء الغذائي"
Boreal forest (taiga) "الغابة الشمالية التايغا"
This is how a bullet works "anatomy of a bullet"