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How Does Herd Immunity Keep a Country Safe From Diseases?
science.howstuffworks.com/life/cellular-microscopic/herd-immunity.htm
Herd immunity relies on the principle of safety in numbers as far as vaccinations go. Find out why herd immunity is an important public health issue.
How the U.S. Customs Service Works
people.howstuffworks.com/us-customs-service.htm
A fascinating article that tells you everything you need to know about U.S. customs laws, how they affect your travels and what you may bring back into the United States!
How Immigration Works
people.howstuffworks.com/immigration.htm
Immigration is one of the most controversial subjects in America today. Learn how immigration works and about visas, green cards and amnesty.