Concrete
May 14, 2020•42 min•Ep. 4
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Episode description
In today's episode, Zack has 30 minutes to become an expert on... Concrete! This was a "hard topic"... okay now that that's out of the way, let's learn about concrete. What's it made from? Is it the most prevalent building material on earth? (hint - why would we ask if it wasn't!) And finally, is it destroying the planet? (see previous hint!)
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