The authors historically review bibliographic research concepts and define globalization in time. Moreover, recent free online data exchange is important in terms of medical progress, scientific updating and patient-care improving. In the author's opinion, data globalization is favoring medical knowledge flow even more. The concept of a traditional library has radically changed over time, gradually missing their pivotal role in research activity. To date, the birth of the Internet and its sudden development has given a great boost to the spread of worldwide information, quickly and cheaply. Nevertheless, besides the advantages, the Internet also hides misleading risks. In this paper, the professional Medline source is compared to common Internet sources. The authors state that Internet sources have a great importance in the spread of medical knowledge. They conclude, however, that the risk of too much available information could lead to a decrease in quality.