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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 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.