How is air quality measured?

As smoky air from Canada’s wildfires shrouds broad swaths of the U.S., here are seven facts you should know about measuring air quality.

Heads up: 7 planets will be in retrograde this summer

The planet Mercury is in retrograde most often because it's the fastest planet traveling around the sun, NASA explained.

Critically endangered turtle hatchlings found, captured on video

According to researchers, this is the first official record of Burmese peacock softshell turtle hatchlings in the wild.

Mount Pleasant ducks 'shot and killed,' 2 people sought
video

Racine County sheriff's officials are looking to identify two people after taking reports of ducks being "shot and killed."

Killer whales are attacking, sinking boats and scientists are unsure why

Aggressive orcas are attacking boats in Western Europe and the increase in sightings of this behavior is confusing scientists. The latest in a series of reported incidents happened off the coast of Spain in the Strait of Gibraltar on Thursday. 

Watch: Dingo bites sunbathing tourist on Australian beach

Wild video shows the moment a dingo moved in on a group of beachgoers and bit a French tourist's backside.

Deadly bear attack in Groom Creek near Prescott: Necropsy conducted, results announced

A 66-year-old man died after being mauled by a black bear in an "exceedingly rare" attack in a community south of Prescott, according to the Yavapai County Sheriff's Office.

Biden administration moves to restore endangered species protections dropped by Trump

The Biden administration has proposed new rules for protecting imperiled plants and animals as officials move to reverse changes under former President Donald Trump that weakened application of the Endangered Species Act.