Camila Domonoske

More than 24 hours after an explosion struck a coal mine in southwestern China, 20 miners are still missing, state media report.

The Xinhua news agency says 35 miners were working at the privately-owned Jinshangou mine when the explosion happened Monday morning; two escaped alive, and 13 have been confirmed dead. (Early reports had suggested 15 deaths.)

Hundreds of rescuers are "working around the clock" to dig through debris and search for survivors, Xinhua reports.

Around 4,700 public transportation workers in Philadelphia went on strike at midnight, shutting down many of the city's transit options.

The members of the Transport Workers Union Local 234 and the Southeastern Pennsylvania Transportation Authority, or SEPTA, were unable to agree on a new contract.

The strike is causing widespread disruption, and raising concerns that if the situation is not resolved it may interfere with Election Day next week.

Voice recognition surrounds tech-loving Americans, from Siri to Google Assistant to Amazon Echo. Its omnipresence can make it easy to forget that making this technology has been really, really hard.

Understanding human speech is one of the most difficult frontiers in machine learning, and the biggest names in technology have devoted much time and money to conquering it. But their products still work for only a handful of languages.

Less prominent languages are still indecipherable to computers — even for text translations, let alone voice recognition.

On Sunday, India celebrated Diwali with lamps, candles, feasting and fireworks. Now, a day after fireworks for the festival of lights, New Delhi is choked with a thick, dark smog.

The celebrations sharply exacerbated the city's perpetual pollution problems — the BBC reports that in the wake of the fireworks, levels of extremely small particulate matter more than doubled over the course of a few hours.

A gas explosion at a coal mine in China has killed 15 miners, and another 18 miners are missing and presumably trapped underground, Chinese state media report.

According to Xinhua, more than 200 rescue workers were at the rural mine near the city of Chongqing, looking for any survivors.

The explosion hit Monday morning, NPR's Rob Schmitz says, when 35 miners were working. Two of them escaped.

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