Once Mark Twain and two friends were sitting in a restaurant
One friend has just returned from a trip to Vermont.
The friend said that the air in the mountains of Vermont was very clear.
In many places
the echo of a voice came back five times stronger than the original voice.
The second friend said that was nothing.
In Colorado,where he lived,in many places
the echo of a voice spoken in the morning came back in the afternoon.
Mark Twain laughed, Then he said,
Listen!The echoes which you have told me about are very unusual.
But in a small church in Missouri, where I was born,
there is an echo more unusual than those.
"What is so strange about the echo there?"asked one of them.
"Well,I will tell you,"said Mark Twain
"The echo in that church is so unusual that if one asks in a loud voice:
Good Morning!How are you?The echo repeats very clearly after a moment:
Very well,thank you. And how are you?