For a while, I was clueless about what I was going to write for E. Nothing seemed to be appropriate. Thanks to the small kid who was asking his father about why he kept hearing his own voice over and again, for having given me another idea for my blog :-)
Just so you know, echoes aren't restricted to Physics alone, they have a lot of significance in our everyday lives too.
Wikipedia says, Echoes are reflections of sound, arriving at the listener some time after the direct sound.
Think about this. There is one world. Some people like to live here, some people don’t. Some people are always cynical, while some can’t stop lavishing praises on its beauty. But still, there is just this one world. How is all this possible?