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Tuesday, September 1, 1959.

The sky is practically completely overcast. I can see at least one star off to the

west. Much of the sky is overcast. This is Tuesday, September 1, 1959. The time is 8.15 p.m.

8.15 p.m. Central Standard Time.

This recording that you were listening to is 66 years old, and it was the first of its kind, ever.

After that initial bit of introduction, you are now listening to the sound of birds migrating through the inky darkness of night.

If you tried the same thing today, you might use a small handheld microphone.

But back then, it was a really, really big one, sitting in a six-foot-wide dish surrounded by bales of hay.

Basically, it was a lot of work to get this sound.

And the guy you hear on the tape,

which was real-to-reel-ta-reel tape, by the way, is Richard Graber. In 1957, he and Bill

Cochran became the first people to record these nocturnal flight calls. And when they did,

they peered more deeply into the mysteries of bird migration than arguably anyone ever had.

I'm Jacob Job, and you're listening to Scientific Americans Science Quickly.

Birds have fascinated people for centuries.

But until relatively recently, we've

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