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There's no reason for you to have a dozen different types of glasses on your home bar, so why do bartenders serve cocktails in so many different types of glasses? Well, this video from PBS's IdeaChannel explains where all those glasses came from, and whether they matter.
Take a peek into almost any office. What do you see? Workers hunched over their computers. Look at your fellow commuters on the subway. How do they sit? Slumped over their smartphones. Survey the friends and loved ones around you. How do they stand and walk? Likely a little stooped over.