How is concrete made? And why does it matter?
Brains On! Science podcast for kids
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Why Moss Does Well on Concrete?
Moss has adapted to live in some of the harshest places on the planet. Daniel says there's a special type of bird that turned out to be perfectly suited to a city full of cement. Even though pigeons and moss have learned to live with concrete, it can also cause problems for the natural world.
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