Isang Litrong Liwanag : The solar bottle
While reading the tweets of the people I follow, one from Andrew Revkin got my attention : “ H. sapiens, innovator: Solar “light bulbs” from water-filled soda bottles brighten tin-roofed slums. “ This was how I got introduced to Isang Litrong Liwanag ( “A Liter of Light” ), one of the most brilliant ideas I …
