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Michaeleen Doucleff, PhD, is a correspondent for NPR's Science Desk. For nearly a decade, she has been reporting for the radio and the web for NPR's global health outlet, Goats and Soda. Doucleff focuses on disease outbreaks, cross-cultural parenting, and women and children's health.

The river is expected to peak at around 19 1/2 feet later this weekend, but not before it swallowed up streets, halted all boat traffic and sent rats scurrying through the city.

The Falcon 9 rocket was carrying supplies to the International Space Station when it exploded June 28. Musk, the SpaceX CEO, said that going forward, the company will individually test each strut.

NASA's New Horizons spacecraft has beamed back its best photos of Pluto and its moons. Scientists will puzzle over them for years to come.

The meteor that caused at least 1,000 injuries in Russia after a startling and powerful daytime explosion one week ago has been identified as a chondrite, the most common type of meteor that falls on Earth. But that hasn't stopped a black-market economy from developing around the fragments.

Just for the sake of financial fun, we've calculated how much platinum it would actually take to mint a coin with $1 trillion worth of the metal in it. Turns out, it's probably more platinum than mankind has available on the market right now.

A Japanese company lost contact with its unmanned Hakuto spacecraft moments before touchdown on the moon Wednesday, saying the mission had apparently failed.

Audiences heard James Earl Jones' voice as the iconic Star Wars villain, but it was Prowse behind Darth Vader's mask.

At first the teachers were skeptical, but after two weeks they joined in "because the music is full of energy ... it really gets the happiness flowing," Zhang Pengfei told a local newspaper.

In her nearly 20 years at NPR, Tracy Wahl has established herself as a champion for innovation in the newsroom. She was among the first at NPR to embrace social media as a way to engage audiences and deepen our journalism through crowd-sourced reporting. She launched Morning Edition's first Twitter account, and led the program's early ventures into multi-platform storytelling.