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The virus is clearly far less contagious than the coronavirus, scientists agree, but they have found cases where it spread among people without direct contact.

It’s a nightmare faced by families all around Los Angeles: After wildfire smoke blanketed homes, schools and offices with toxic chemicals, when is it OK to go back?

Pictures and striking scenes from the making of perhaps the world’s most celebrated naturalist.

Stardust Solutions says its tiny spheres can reflect the sun’s rays without harming people or the environment. Critics say private companies have no business altering Earth’s atmosphere.

The attack, at a remote uranium mining site in northern Saskatchewan, was only the fourth fatal black bear encounter in the province’s recorded history, officials said.

As the leader of the C.D.C.’s influenza division, she battled to keep up with an ever-changing viral opponent, building a global network of researchers and forecasters.

In a letter to President Trump, the spokesman, Rich Danker, said allowing the sale of flavored e-cigarettes would enhance their appeal to children.

In a dispute over vapes, the president sided with tobacco companies that filled his groups’ coffers over his own F.D.A. commissioner, who resigned in protest.

The creation, care and keeping of creatures is a responsibility the last full-time museum taxidermist in the U.S. takes both seriously and joyfully.

In her second pop-science book, theoretical cosmologist Chanda Prescod-Weinstein returns to her celestial and cultural roots.