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In ancient times everything from salt grains to elephant teeth were considered as a form of currency. So basically the concept of currency revolves around the fact that a group of person consider that an item is valuable. Initially there was the barter system of course, i.e exchanging goods of necessity and then came the concept of metals like gold, money and so on. But the world has adopted the slogan of "Go digital".

What does the future hold for the world's largest renewable energy source, hydropower? Hydropower is an incredibly old source of energy, tracing its usage back to the watermills that have been a staple of civilisations since ancient times. Today, it is the largest source of renewable energy in the world, with an installed capacity of over 1126GW in 2018. Hydropower is particularly prominent in China, where the world's largest power station Three Gorges power plant in Hubei province produces 22.5GW. Other massive projects also dot the country, including the Xilodu (12.3GW) and Longtan (6.3GW) dams.