So how many stars are there in the Universe? It is easy to ask this question, but difficult for scientists to give a fair answer! Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way.
Reverse osmosis. Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
RO Systems, or reverse osmosis filters, water treatment removes ionized salts, colloids, and organic molecules right down to a molecular weight of 100. The Environmental Working Group released research on December 20, 2010 that Hexavalent Chromium or Chromium-6 has been discovered in 31 of 35 U.S. cities.