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.
Orson Wells played Tesla in the 1980 Yugoslavian film Tajna Nikole Tesle (English translation: The Secret of Nikola Tesla). In his latter years, Tesla asserted that he had indeed discovered a limitless power supply from a source that no one else had even suspected, but he never revealed the source.