Here's an incredibly advanced sound system so small you can wear it on the side of your head! The explosion was so loud, it was heard 3,000 miles (4,800 kilometers) away! When the Krakatoa volcano erupted in 1883, 5 cubic miles of rock were hurled high into the air with a horrendous roar. That roar demonstrates the amazing range of the human ear. Because not only could human ears on nearby islands withstand "the awesome shock, but people thousands of miles away could also detect a faint rumbling. Few organs of the body accomplish so much in as little space as the ear. If an engineer could design and construct an ear, he would have to squeeze an advanced sound system into roughly I cubic inch (16 cubic centimeters).
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