Professor Bill Hammack, aka YouTube's Engineer Guy, is one of my favorite new subscriptions. He has a gift for breaking very complex things down in a way that are easy to understand. Take some time and watch how a golf ball is made, how hard drives work, and how cell phones are designed.
What's in our landfills?
If you cracked open your average landfill, what would you find inside? The answers might surprise you.
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