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RENEE MONTAGNE, HOST:

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LINDA WERTHEIMER, HOST:

Good morning. I'm Linda Wertheimer. Faster than a speeding bullet, more powerful than a locomotive and not born in Ohio. The idea of Superman was conceived in Glenville, Ohio back in the 1930s, but when a proposed Superman-themed license plate called Ohio birthplace of Superman, DC Comics and Warner Communications objected. Superman, they point out, was born on the planet Krypton. It's MORNING EDITION. Transcript provided by NPR, Copyright National Public Radio.

Former Egyptian President Hosni Mubarak is said to be on life support after suffering a stroke in prison. Meanwhile, demonstrators are still gathered in Tahrir Sqaure protesting moves by the interim military government to seize power.

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RENEE MONTAGNE, HOST:

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LINDA WERTHEIMER, HOST:

Now, for a global perspective on our national weight problem. The number of humans on the planet is now more than seven billion. And our total weight is 287 million tons. That number comes from a new study that suggests weight, and not just headcount, should be considered when looking at the impact of people on the planet.

RENEE MONTAGNE, HOST:

To find out more, we called Ian Roberts. He's a professor at the London School of Hygiene & Tropical Medicine, and is the lead author of this study.