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.
The Time Nikola Tesla Paid for His Hotel Room With a Death Ray. Nikola Tesla was, of course, a vastly accomplished scientist and inventor. His inventions include the Tesla coil and electric oscillators, and he also developed technologies that were eventually found in X-rays, the radio, and remote controls.