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Andrew Song and Luke Iseman of Make Sunsets ready for a launch. Iseman says they hope to someday cool the earth on a larger scale.

Startups want to cool Earth by reflecting sunlight. There are few rules and big risks

In a parking lot and on San Francisco Bay, NPR witnesses two different tests for solar geoengineering to tackle climate change. With much science unsettled, experts say regulations aren't keeping up.

Muslim pilgrims pray around the Kaaba, the cubic building at the Grand Mosque, during the annual Hajj pilgrimage in Mecca, Saudi Arabia, Sunday.

Standing where Prophet Muhammad gave his final sermon, 2 million Muslims perform Hajj

This is the largest pilgrimage since 2019, after which the Hajj was dramatically curbed due to coronavirus restrictions.

Salt Lake City sits in a bowl of a mountain valley where dirty air can get trapped for days during winter inversions.

Utah is pushing back against ever-tightening EPA air pollution standards

The Biden administration is unveiling new, stricter pollution standards for American cities such as Salt Lake City, Utah, which have long struggled with chronically dirty air.

Temu promises cheap goods. Here's how the shopping app does it

Temu aggressively markets "hot deals," such as a hooded button-up fleece jacket for $8.32. But some U.S. officials accuse Temu of unfair and/or unethical practices.

A cicada sheds its nymph shell in Chevy Chase, Md., during the emergence of Brood X in May 2021.

Billions of cicadas will buzz this spring as two broods emerge at the same time

Billions of cicadas will emerge this spring across eastern and southern states as two broods arrive simultaneously for the first time in more than 200 years.

Workers crate mortar launchers in an assembly shop of the Ukrainian Armor Design and Manufacturing Co. Ukrainian Armor produces specialized armored vehicles as well as mortar launchers.

With Western military aid increasingly uncertain, Ukraine builds its own weapons

Ukraine's domestic arms manufacturers bristle at the notion the country relies entirely on military aid from the U.S. and Europe. The country's weapons development and production, they say, is robust.

George Gershwin, photographed in his 72nd Street apartment in New York in 1934. His Rhapsody in Blue premiered 100 years ago on Feb. 12, 1924.

'Rhapsody in Blue': After a century, Gershwin's musical melting pot still resonates

On Feb. 12, 1924, a sassy fusion of jazz and classical music debuted in New York, sparking a mutual exchange of ideas still debated today.

As North Korea launches missiles and artillery, this island's residents are terrified

Residents of a South Korean island attacked by North Korea in 2010 fear it could become a flashpoint again. They hid in air raid shelters in early January after North Korea conducted artillery drills.

On Sept. 11, 2001, 343 firefighters and paramedics were killed, most when the towers collapsed. Now, an equal number have died from 9/11-related illnesses, the FDNY says.

FDNY deaths from 9/11-related illnesses now equal the number killed on Sept. 11

Two recent deaths brought the total to 343, matching the death toll from Sept. 11, the FDNY said. Some 11,000 former and current FDNY employees suffer from 9/11-related illnesses, 3,500 with cancer.

Left: Rep. Bill Huizenga, R-Mich. Right: Rep. Scott Peters, D-Calif.. The two are co-sponsoring legislation to create a bipartisan, bicameral commission to address the national debt.

As federal debt grows, a bipartisan push for another commission to address it

Michigan Rep. Bill Huizenga, R-Mich.,, and California Rep. Scott Peters, D-Calif., say looming benefit cuts and mounting interest payments squeezing federal investments underline need for their plan.

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