Traveller's cheques and credit cards (American Express, Visa, Mastercard) are exchanged for Vietnamese dong at the banks. Cards can be used in travel agencies, hotels, and major restaurants. US currency is exchanged for Vietnamese dong and treasury notes in banks, exchange bureaus, hotels, and jewellery shops.
Nikola Tesla designed the first hydroelectric power plant at Niagara Falls, New York which started producing electrical power in 1895. This was the beginning of the electrification of the United States and the rest of the world. Today, Teslaâs AC electricity is lighting and powering the globe.
During this period young Niko saw a steel engraving of Niagara Falls. In his imagination there appeared a huge water wheel being turned by the powerful cataract. He said to an uncle that he would go to America one day and capture energy in this way. Thirty years later he did exactly that. Despite his early creativity, Tesla did not begin to think of himself as an inventor until he was a young adult.