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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.
The horizontal fraction bar was introduced by the Arabs.
There are more nerve cells in one human brain than there are stars in the Milky Way.
There are 60,000 miles of blood vessels in every adult human.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.