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.
In 1901, he began construction of the 57m high Wardenclyffe tower in New York. Ostensibly for telegraphy, he used the tower to further his experiments into the transmission of electricity. But by 1906, his chief financial backer JP Morgan grew dissatisfied with Teslaâs experiments and withdrew funding. Teslaâs plans were in ruin, he became desperate and, according to biographers, suffered a nervous breakdown. Nikola Tesla in 1890