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.
Tesla worked for Thomas Alva Edison for 1 year!! Edison was locked into direct current and would not change for anything. DC had very severe limitations, and was not practicable for long distance electrical transmission. Almost immediately after entering the U.S., Tesla went to work for Thomas Alva Edison.