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 Invention Of Radiant Energy. It is no secret that Sir William Crookes was the mastermind behind the discovery of Radiant energy properties. His discovery took place in the year 1875, and since then has prompted others into farther experimentation with solar uses. One scientist Nikola Tesla made some interesting discoveries concerning electrostatic charges and their results. His persistence led to the invention of light that we now call radiant energy. Tesla radiant energy discoveries showed that this type of energy was easily transferable from one place to another. He also proved that light traveled almost the same way as sound does, by sign waves.