KNOW IT ALL: Wednesday's Top 7 Stories at NBC News

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Good morning. Here are a few stories we're following today:

1. Utah Flood Victims ‘Didn’t Have a Chance’

Volunteers will resume the search Wednesday for a missing victim of flash floods that devastated a Utah town. At least 16 other people were killed by what was described as a wall of water. Read more in NEWS.

2. Round 2: Debate Night for Republicans

Fifteen Republican presidential candidates face off at the Reagan Library in California. Donald Trump spoke aboard the USS Iowa on Tuesday and said some undocumented immigrants are treated better in the United States than veterans. Read more in POLITICS.

3. Firefighters Gain Ground Against California Wildfire

The so-called Valley Fire, which has consumed almost 600 homes, is now considered 30 percent contained. Rain and lower temperatures are helping, but authorities warn that the fire, which covers 67,000 acres, has room to grow. Read more in NEWS.

4. Where Is the U.S. in the Battle for the Arctic?

Think of it as a new cold war — and some say the United States is losing. Global warming is melting ice and opening the northern waters, creating both opportunities and problems. Read more in NEWS.

5. Seventh ‘Dead Man Walking’ for Nun

Oklahoma is set to execute a death row inmate on Wednesday despite pleas from football coach Barry Switzer, Susan Sarandon and Sister Helen Prejean, best known as the nun from “Dead Man Walking.” Read more in NEWS.

6. Kremlin: Putin Did Not Call Elton John

The singer said he got a call from the Russian president after requesting a meeting to talk about gay rights. But the Kremlin says it never happened. A Putin spokesman does say the Russian leader would be willing to talk. Read more in NEWS.

7. Study: Playing Outside Helps Kids’ Eyes

A Chinese study of 1,900 first-graders found that those who played outside for an extra period had a lower risk of nearsightedness. But the effect wasn’t as major as researchers had hoped. Read more in HEALTH.