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It's Okay to Be Smart
Where On Earth Do You Weigh The Least?
Season 7
Episode 4
You may have heard that a kilogram of feathers weighs the same as a kilogram of steel, but that all depends on where you weigh them. This video is all about the difference between mass and weight, and how weirdly awesome Earth’s gravity really is.
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10:16
The real magic of mirrors is far stranger and more interesting, as you’re about to learn.