oxygen For the 1st time, NASA’s Perseverance rover makes oxygen on Mars 4 years ago NASA's Perseverance rover just scored another first on Mars, one that may help make ready for astronauts to explore the… World Oceans Day 2020: Dates, Theme, History, Significance and How to celebrate it? 4 years ago Today (June 8) is celebrated as World Oceans Day over the world to remind the individuals about the significance of…