National News

A smog alert day in Dalian, China. The photo was taken on December 19.

Read The Smog-Inspired Poem That China Can't Stop Talking About

A poem written by a Chinese surgeon lamenting the medical effects of smog, called "I Long to Be King," is going viral on Chinese social media. Told from the perspective of lung cancer, the poem takes an apocalyptic note:

Happiness after sorrow, rainbow after rain.

I faced surgery, radiotherapy, and chemotherapy,

But continued to chase my dream,

Some would have given up, but I will be the king.

Dylan and Hayden (front, left to right) are adopted 10-year-old twins. Born a boy, Dylan has identified as a girl since age 4. Her mothers Jennifer and Marla (top, left to right, with daughter Michaela in the middle) had planned to change the gender listed on Dylan's official documents when she got a driver's license. They sped up that process after Donald Trump's election.

Transgender Americans Race To Finish Paperwork Before Trump Administration

Many transgender people in the U.S. are rushing to change their designated gender on government documents before President-elect Donald Trump takes office. They worry the next administration may take that ability away.

There's no indication so far that this is a priority for Trump. Mara Keisling with the National Center for Transgender Equality says Trump's positions on trans issues are not clear. But she's concerned about people he's nominated for key positions in his administration.

For the first time, scientists have synthesized a three-stranded molecular braid that twisted into a knot with eight crossings, as in this rendering.

Scientists Have Twisted Molecules Into The Tightest Knot Ever

Tying a knot can be tricky. Just ask any kid struggling with shoelaces. And scientists have it even harder when they try to make knots using tiny molecules.

Now, in the journal Science, a team of chemists says it has made a huge advance — manipulating molecules to create the tightest knot ever.

FBI Director James Comey, shown here testifying on Capitol Hill on Tuesday, has told friends and employees he had few good choices in the investigation into Clinton's handling of classified information on her private email server.

DOJ Watchdog To Review Pre-Election Conduct Of FBI, Other Justice Officials

The Justice Department's watchdog has launched a sweeping review of conduct by the FBI director and other department officials before the presidential election, following calls from Congress and members of the public.

New Gene-Editing Techniques Hold the Promise Of Altering The Fundamentals Of Life

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Maracanã Stadium's turf is dry, worn and filled with ruts and holes. Those soccer clubs that call the stadium home plan to meet and discuss how to bring Maracanã up to game-worthy shape. The question is, who will pay for the repairs?

Maracanã, Jewel Of Rio's Olympics, Now Languishes In Disrepair

Maracanã Stadium has been a fixture of the Rio de Janeiro skyline for decades. Opened just in time to play host to Brazil's heartbreak in the 1950 World Cup, it underwent massive renovations to host ... well, more heartbreak for Brazilians in the 2014 World Cup.

The 2014 Jeep Grand Cherokee is among the vehicles that allegedly have emissions-altering software.

EPA Accuses Fiat Chrysler Of Installing Emissions-Cheating Software

The Environmental Protection Agency said Fiat Chrysler violated the Clean Air Act by allegedly installing and failing to disclose software in some 104,000 cars and trucks that alters emissions.

The automaker was required by law to disclose the software to regulators during the certification process but did not do so, the EPA announced Thursday. While the agency is still investigating the nature of these devices, it said the software results in increased emissions of nitrogen oxides.

A mouse with predatory brain circuits switched on is much more likely to attack and kill prey like this cricket.

Flipping A Switch In The Brain Turns Lab Rodents Into Killer Mice

Mice that kill at the flip of a switch may reveal how hunting behavior evolved hundreds of millions of years ago.

The mice became aggressive predators when two sets of neurons in the amygdala were activated with laser light, a team reported Thursday in the journal Cell.

Afghan villagers gather around several victims' bodies who were killed in the November battle in Kunduz province, Afghanistan.

U.S. Forces 'Acted In Self-Defense' In Battle That Killed 33 Civilians In Afghanistan

A U.S. military investigation has cleared the U.S. forces of wrongdoing in fighting that left 33 civilians dead and 27 others wounded last year in Afghanistan's Kunduz province, saying that they acted in self-defense.

"To defend themselves and Afghan forces, U.S. forces returned fire in self-defense at Taliban who were using civilian houses as firing positions," according to the U.S. military report published Thursday.

Menopause Mystery: Why Do Female Killer Whales Experience The Change Of Life?

Menopause is a mystery to evolutionary biologists, but new insights could come from a long-term study of killer whales.

In these whales, the explanation may lie in a combination of conflict and cooperation between older and younger females, according to a report published Thursday in the journal Current Biology.