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By definition, when a medication is administered intravenously, its bioavailability is 100%.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
The horizontal fraction bar was introduced by the Arabs.
Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.