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The National Academies of Sciences, Engineering and Medicine sorted through 10,000 studies to determine the good and bad health effects of marijuana. Tight drug restrictions impede research, they say.

Also: Survivors recall horror of flooding in the Philippines; authorities stage a dawn raid on protesters in Cairo's Tahrir Square; Gingrich and Romney are tied in a new poll of Republican voters.

Also making headlines: Euro zone nations push for deal to address crisis; U.N. climate summit approaches "decision time;" missing ex-FBI agent appears in hostage video.

Also: Syria's rebels accused of killing civilians; and Utah finds a way to reopen its national parks.

The startling 101.1 reading was recorded in Manatee Bay, near Everglades National Park. The rising ocean temperatures, driven by climate change, are already endangering nearby coral, experts say.

House Democrats held leadership elections Wednesday. Nancy Pelosi was re-elected despite facing an unexpected challenge from Ohio Democrat Tim Ryan. David Greene speaks with NPR's Susan Davis.

After two daily episodes, Das Coronavirus Update, a podcast by one of the world's leading virologists, shot to No.1 in Germany. When does a top coronavirus researcher find time to do a podcast?

Germany's president resigns amid scandal; Libya celebrates a year after uprising; Romney, Santorum step up campaign in Michigan.

Also: Activists accuse Assad regime of misleading Arab League monitors; one officer dies, five others are wounded in Utah shootout with suspect.

Taliban vow revenge for killing of civilians; oil imports drop, Syrian militiamen blamed in latest slaughter in Homs, and more.