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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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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.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Thyroid conditions may make getting pregnant impossible.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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