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Climate: Saving Old Trees Might Save Lives

ALEXANDER NAZARYAN

We know that trees are good for cities. A new study finds that mature trees are especially good.

Trump Announces a New Policy for a ‘Golden Age of Space Transportation’

KENNETH CHANG

The policy aims to greatly increase the number of spacecraft launches and re-entries.

‘Earth-like’ exoplanets may exist—but we don’t know of any yet

Claiming an exoplanet to be "Earth-like" is a trend that needs to bite the dust

The national debt is $40 trillion. What does that mean mathematically?

An investigation into the incomprehensibly, unfathomably large amount of money the U.S. owes

What happened when people with anorexia tried magic mushrooms

Researchers are exploring whether magic mushrooms could offer a new treatment for anorexia

What you need to know about West Nile virus

The mosquito-borne illness has sickened hundreds of people this year

Why this El Niño will be the largest in living memory

A strengthening El Niño may surpass any seen since the 19th century and will usher in another record hot year or two

Why tornadoes touched down near New York City

Twisters don't touch down in New York City often, but they can when the conditions are just right

Is lettuce safe to eat yet? New data suggest cyclosporiasis cases are slowing

After a spike in infections in July, this explosive-diarrhea-causing outbreak may be coming to an end

How Trump Is Trying to Crush California’s Climate Policies

MAXINE JOSELOW

At least a half-dozen federal agencies have taken action against the state that has led the nation in environmental protections.