Ever wondered how the level indicator on a Battery works? Here is how.

Source :  http://www.webexhibits.org/causesofcolor/15A.html http://www.qualcomm.com.au/products/mirasol-display-technology

4.5 Billion years ago infant Earth bombarded with incoming bouldering rocks, slowly grew in…

Source:  https://www.quora.com/How-is-a-double-rainbow-formed http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/lw/nbstr.rxml