@CNN: Before the invention of radar during World War II, incoming enemy aircraft were spotted using “sound locators” that looked more like musical instruments than tools of war https://t.co/A2fafEYvva https://t.co/GxraUU9yUl

@CNN: Before the invention of radar during World War II, incoming enemy aircraft were spotted using “sound locators” that looked more like musical instruments than tools of war https://t.co/A2fafEYvva https://t.co/GxraUU9yUl