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.
Here âthere were a few mechanical models which interested me and turned my attention to water turbines.â After hearing a description of the great Niagara Falls, Tesla âpictured in my imagination a big wheel run by the Falls.â He proclaimed to his uncle that one day he would âgo to America and carry out this scheme.â.