As surprising as its age is, the Internet was born from the U.S. military's need to construct a decentralized computer network that could withstand a nuclear war. The network was used and refined by universities throughout the 1970s and 1980s, but it wasn't until 1992 that the Internet was made available to the general public.
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The Euro has been in use in Greece since January the 1st, 2002. So, now Euro (?) is the official currency of Greece. Before that date, the currency that was used in Greece was the drachma.