51% of the U.K. — a majority, by a slim margin — has voted to leave the European Union.

It's a historic decision that is sure to reshape the U.K.'s place in the world and have huge implications on the global economy.

In fact, the British pound has already fallen 10% — to a 30-year low — and Asian and American stock markets are currently tumbling.

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Is it better to use precaution or to wait for proof?

That's a complex and contentious question in many ways — but especially when it comes to regulating chemicals.

In general, the European Union has taken a more public precautionary stance on these regulations, while the United States generally requires a stronger proof of harm to regulate or restrict chemicals.

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Seventh Generation

As Luna Lovegood in the "Harry Potter" films, Evanna Lynch was quirky, kindhearted, and ever-optimistic.

Sometimes she was picked on for her oddities. But she never became angry.

Now the actress is showing a tougher side.

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