|
|
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
The familiar sounds of your heart are made by the heart's valves as they open and close.