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When two neutron stars merge and create a black hole, they produce a powerful blast of gamma rays. A. Simonnet (Sonoma State Univ.) and NASA’s Goddard Space Flight Center

Unusual, long-lasting gamma-ray burst challenges theories about these powerful cosmic explosions that make gold, uranium and other heavy metals

Gamma-ray bursts occur when a massive star explodes or when two neutron stars merge. A newly discovered burst has puzzled astronomers, as it lasted much longer than astronomers would have expected.
The vast majority of Buddhists in historical and contemporary times have been followers of Mahāyāna Buddhism. Fred de Noyelle / Godong/Stone via Getty Images

What is Mahāyāna Buddhism? A scholar of Buddhism explains

The Mahāyāna branch of Buddhism likely emerged around the first centuries A.D. and was most readily carried through the Silk Road and maritime trade routes.
Terry Hubbard, a former felon, voted in the 2020 presidential election and was arrested two years later in Florida on voter fraud charges. Josh Ritchie for The Washington Post via Getty Images

How a 2013 US Supreme Court ruling enabled states to enact election laws without federal approval

In the Shelby v. Holder decision, a key section of the landmark 1965 Voting Rights Act was eliminated, thus enabling states with histories of racial discrimination to enact new voting laws.
Boddhisatva Avalokiteśvara, considered to be a compassionate protector, is believed to regularly visit Earth. taikrixel/ via iStock Getty Images Plus

What is a bodhisattva? A scholar of Buddhism explains

Buddhists believe that bodhisattvas reside in heavenly realms but can also appear on Earth disguised as humans, animals or other types of beings.
A raccoon with a fish at the Corkscrew Swamp Sanctuary in Naples, Fla. Michael Siluk/UCG/Universal Images Group via Getty Images

What is a wetland? An ecologist explains

The US Supreme Court opens its 2022-2023 term with a case that could greatly reduce federal protection for wetlands. Here is what makes these ecosystems valuable.

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