"Echoes" - Richard Franz

If you have ever stood in an empty warehouse or at the entrance of a cave, you have likely shouted your name or “Hello!” and then listened as the empty space echoed back to you. One of God’s amazing, though often misunderstood, creatures that uses echoes to its advantage is the bat—and there is an important lesson to learn from them! - Full commentary here: https://www.tomorrowsworld.org/commentary/echoes