After decades of study, scientists have developed a model to explain how violent solar spicules form.
By NICHOLAS ST. FLEUR
In the most comprehensive study of egg shapes to date, scientists say that the best predictor of long or pointy eggs is a bird’s flying ability.
By STEPH YIN
Historical observations of bright nights that were almost like daytime have a new explanation in forces of the upper atmosphere.
By JOANNA KLEIN
The Mars Reconnaissance Orbiter has been taking images of the rover about every three months to monitor the surrounding area for changes.
By KENNETH CHANG
Cuts to Medicaid May Limit Access to Nursing Homes
Medicaid, targeted for deep cuts by the Republican health care bill, currently pays for most of the 1.4 million people in nursing homes.
By JORDAN RAU
Dr. John Sarno, 93, Dies; Best-Selling Author Tied Pain to Anxieties
Dr. Sarno was both hailed and dismissed for his contention that most chronic pain could be traced to deep within the psyche.
By ADAM CONNER-SIMONS
Senate Health Plan Falls Short of Promise for Cheaper Care, Experts Say
Republicans say a new health law would make it easier and more affordable to get care. But the opposite may be true.
By REED ABELSON
The Times’s Resident Expert for a World on Fire
Canada, Portugal, London: How the fire expertise of our Phoenix bureau chief informs our global reporting.
By FERNANDA SANTOS
Turkey Drops Evolution From Curriculum, Angering Secularists
A chapter on evolution will no longer appear in ninth graders’ textbooks because it is considered too “controversial” an idea, an education official said.
By PATRICK KINGSLEY
Xi Jinping Is Set for a Big Gamble With China’s Carbon Trading Market
A carbon trading program is shaping up as a big policy retort to President Trump’s decision to quit the Paris accord. But getting local industries on board will be a challenge.
By CHRIS BUCKLEY
Insurers Battle Families Over Costly Drug for Fatal Disease
The case of Exondys 51 poses emotionally charged issues for families of young boys with a rare illness, who are fighting companies to get coverage for an expensive drug approved on a lower bar of proof.
By KATIE THOMAS
14 Years Old. Losing Muscle Every Day.
Nicolas is 14 and has Duchenne muscular dystrophy, which is robbing him of his muscles — and his life. A new and expensive drug may help, but can he get it?
By MARGARET CHEATHAM WILLIAMS and BEN LAFFIN
Review: In ‘Food Evolution,’ Scientists Strike Back
Scott Hamilton Kennedy’s documentary gives G.M.O. opponents their say, but leaves the last word to food technologists, who insist on reviewing the data.
By DANIEL M. GOLD
Frédérick Leboyer, Who Saw Childbirth Through Baby’s Eyes, Dies at 98
Mr. Leboyer, a French physician, advocated natural birth methods that focused on easing suffering for the baby.
By JONATHAN WOLFE