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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Thyroid conditions may make getting pregnant impossible.
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.
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.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.