Would you mind explaining To me what happens to a Sound made in the now if It has an echo, because I Was lead to believe that They have no future or past. Galileo Aristotle & De Vinci Were synonymous about The ability of sound to pass Through a substance but Nobody has explained that If they are made in the now They should stay in the now And if they leave the now are They momentarily in the future And when they come back from There are they in the past.