Bonus 4: Woodpecker and black box
50 Things That Made the Modern Economy - Un podcast de BBC World Service
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The last bonus episode of our new podcast. For more, search for 30 Animals That Made Us Smarter and subscribe. Or find it here: www.bbcworldservice.com/30animals This one is about a bird’s remarkable skull and the quest to protect aeroplane flight recorders. #30Animals
