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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.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.