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As fire crews and air tankers work to block the wildfires' explosive growth, images of red clouds of fire retardant falling onto trees are common. What is it — and what's in it?

Americans love olive oil — and import 95% of it. But tariffs are making it harder for Europeans to sell it to Americans.

Libertarian Presidential candidate Gary Johnson remains on the Ohio ballot. But his followers here are still upset after a short-lived challenge to his…

Most of the American outlets on the chopping block are Wal-Mart Express stores. Those are the company's smallest-format locations. Wal-Mart also said it will open 300 new stores in the coming year.

NPR's Melissa Block speaks with John Pistole about the report that found 95 percent of recent covert tests of airport screeners were able to get past security.

His single-payer health care plan would cost an estimated $32 trillion, according to the Tax Policy Center. And it's not balanced out enough by tax increases.

What you do in your 20s and 30s and 40s can make it more likely that you'll be mobile and healthy in old age, scientists say. That's true even if your ancestors didn't fare so well.

The vaccine is nearly 95% effective in preventing illness, according to an interim analysis of a clinical test involving 30,000 people.

Albert Bourla, head of the pharmaceutical giant, discusses plans for distributing its vaccine, which it says is 95% effective, and explains the timing of his $5.6 mllion sale of Pfizer stock.

The Hubble Space Telescope was designed to last 15 years. On April 24, it marks 30 years in space.