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.

No more needles? A daily pill may work as well as Wegovy shots to treat obesity

High-dose oral versions of the medication in the weight-loss drug Wegovy may work as well as the popular injections when it comes to paring pounds and improving health, according to final results of two studies released Sunday night.

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.

Hokey smoke! Flying squirrels soar through NYC treetops

New York has an overlap of northern and southern flying squirrels, and they’re actually in our parks feeding on acorns and fungi.

Titan sub's fatal implosion likely heard on US Navy's secret acoustic system, official says

A U.S. Navy acoustic system detected an "anomaly" on Sunday that was likely the fatal implosion of a private submersible vehicle carrying five people to tour the wreckage of the Titanic, according to a senior military official. 

Lab-grown chicken approved for sale in U.S.

For the first time, U.S. regulators on Wednesday approved the sale of chicken made from animal cells, allowing two California companies to offer “lab-grown” meat to the nation's restaurant tables and eventually, supermarket shelves.