Tag: SUBSTANCE

  • The World’s 17 Most Costly Substances

    The World’s 17 Most Costly Substances

    Whenever you think of luxury and wealth, it is always the gold that comes to our mind first. The gold has been the defacto standard of trading and currencies. However, although the precious metal is among the most expensive in the world, there are many other more expensive materials according to their weight. We make you…