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Southeast Asia's biggest lake is in serious trouble. Drought, dam building and overfishing have brought the Tonle Sap to a tipping point. And as the lake goes, so goes the greater Mekong ecosystem.

NPR's Rachel Martin talks to Mike Chapple, a former computer scientist with the NSA, who says Twitter should have known that its employees were working for a foreign power.

Despite an alarming rush past 300,000 cases worldwide, the WHO's leader says, "We're not helpless bystanders. We can change the trajectory of this pandemic."

Companies are curbing employee travel and canceling major events as they try to minimize disruption from the growing coronavirus outbreak.

Among Native Americans, asthma rates are high, and those with asthma end up in clinics more often, miss more school and work, and are more likely to die from the condition, according to the CDC.

The Dow Jones Industrial Average fell nearly 10% — its biggest one-day drop since 1987 — as the coronavirus pandemic continued to rattle markets. Trading was temporarily halted earlier in the day.

Former Vice President Joe Biden vowed that, if elected, his administration would "lead by science." Sen. Bernie Sanders urged President Trump to declare a national emergency.

Harvard University, Rice University and Ohio State University are among the schools that have paused in-person classes. More than half a million students are affected by the cancellations.

The impeachment battle is playing out with remarkable intensity in a N.Y. congressional district. Republican Elise Stefanik has emerged as a big supporter of the president, but there's been backlash.

Monday morning, the solar system's innermost planet will begin a 5.5-hour march across the disk of the sun. All you need to see it are clear skies and access to a telescope with a sun filter.