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Copyright 2016 NPR. To see more, visit http://www.npr.org/.

SCOTT SIMON, HOST:

We're reporting this week on the most common reading disability. Ask just about anyone what dyslexia is, you'll almost certainly hear something like this.

If you're curious about what people really think about some of the hottest of hot-button food controversies, the Pew Research Center has just the thing for you: a survey of attitudes toward genetic modification, organic food and the importance of eating healthfully.

The survey results are published in a 99-page report that can keep you occupied for days. But if you're pressed for time, here are some of the most interesting highlights that caught our eye.

Each year, a glowing mass of clouds forms over the South Pole, high in the atmosphere, trapped between Earth and space.

From the ground they look wispy and shimmery, like a blue-white aurora borealis. From space, they look like an electric-blue gossamer haze.

A single tornado can cause a lot of damage. But even worse are tornado outbreaks. Just this week, a cluster of at least 18 tornadoes struck the Southeast over two days.

Scientists are seeing bigger clusters in recent years, and they're struggling to figure out what's happening.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

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