Updated at 10:05 p.m.

Nashville Police are warning residents to keep their doors locked and their eyes open for a partially nude man following a shooting early Sunday morning that left four people dead.

There is reason to believe, police say, that the suspect at large is carrying at least one weapon that was not found during a search of the gunman's home.

"One of his guns, a pistol, remains unaccounted for," Metro Nashville Police tweeted Sunday evening.

Zoologist Lucy Cooke says humans have got it all wrong about sloths. "People think that because the animal is slow that it's somehow useless and redundant," she says. But in fact, "they are incredibly successful creatures."

Cooke is the founder of the Sloth Appreciation Society and the author of a new book called The Truth About Animals: Stoned Sloths, Lovelorn Hippos, and Other Tales from the Wild Side of Wildlife. The book aims to set the record straight on some long-held misconceptions about the animal world.

Juliana Hatfield was a darling of the '90s indie music scene. She played with Blake Babies and The Lemonheads and had a hit with the edgy pop song, "My Sister." Hatfield released a string of alternative albums since those days, full of distorted guitars and strong vocals.

When The Exorcist, based on the novel by William Blatty, came to theaters in 1973, it captured the public imagination. Or more accurately, the public's nightmares.

Exorcisms aren't just the stuff of horror movies — hundreds of thousands of Italian Catholics reportedly request them each year. But when William Friedkin directed the movie, he'd never actually seen an exorcism. It would be four more decades before he actually witnessed one.

A menace lurks beneath the snow high up in the southern Rocky Mountains: dust. Lots and lots of dust.

This dust speeds up spring water runoff, causing intense melting and streams to peak weeks earlier than usual — which wreaks havoc throughout the alpine ecosystem. Water managers and fire forecasters alike are sounding the alarm about the consequences of less water flowing in streams and reservoirs.

At first glance the dust seems innocuous. How could something so simple undermine water infrastructure, stress wildlife and lengthen the wildfire season all at once?

Liuba Grechen Shirley has a son who's almost two and a daughter who's almost four. And until recently, the stay-at-home mom and freelance consultant had her childcare routine down.

"The bulk of the child care during the day was up to me," she said. And when she had work to do, she'd get help with watching the kids — but it was free.

"My mother is a teacher. She comes home at 3:30 every afternoon, and she would watch my children from 3:30 on, and that's when I'd start consulting," Grechen Shirley said.

Amnesty International has given Colin Kaepernick its top human rights award for his public opposition to racial injustice. The former San Franciso 49ers quarterback is Amnesty's 2018 Ambassador of Conscience

Teri Schultz reports for our Newscast unit that the "take a knee" campaign that won Kaepernick honor likely cost him his job:

Many political campaign workers spend long hours at low pay, living off of pizza and coffee, all in the hope of seeing their candidate win.

Now, labor organizers are setting their sights on bringing those workers into the labor movement at a time when the percentage of U.S. workers who belong to a union is falling steadily.

The newly formed Campaign Workers Guild claims to have helped organize at least a dozen Democratic campaigns and one political consulting firm.