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Got a tick bite? Here’s what to do and when to seek treatment

Knowing what kind of tick bit you and where you got it can help inform next steps

Will NASA’s SkyFall Mars helicopter fleet sink science at the Red Planet?

Mars researchers are wrestling with the potential costs of a flashy new NASA mission to the Red Planet

Trump’s FEMA Nominee Calls Staff Cuts a ‘Challenge’ for Disaster Agency

SCOTT DANCE

Cameron Hamilton, who briefly led the agency on an acting basis last year but was fired for contradicting the president, also said he would get money out to states faster.

Is Climate Change Supercharging El Niño?

CHICO HARLAN

As a new, potentially record-breaking El Niño begins, researchers are vigorously debating whether climate change is driving the phenomenon’s intensity.

Interstellar Comet 3I/ATLAS is almost as old as the universe itself

The evidence is mounting: this interstellar visitor is even older and weirder than anyone thought

Stem cells banish severe autoimmune disease for 15 years

Two people were the first to receive the therapy for a condition that damages the spinal cord and optic nerve

Why the paint is peeling off the Lincoln Memorial Reflecting Pool—experts explain

Poor preparation and a failure to properly apply the coating may be just a few of the reasons why the Reflecting Pool's new paint job appears to be peeling off

The first ticking ‘nuclear clocks’ are here

These radical new devices keep time using fluctuations in the energy states of an atom's nucleus, rather than those of its electrons, which atomic clocks currently use to define the length of a second

X-Ray Specs for the World’s Oldest, Sealed Letters

KATHERINE KORNEI

A team of historians, scientists and engineers has developed a portable X-ray scanner to study 4,000-year-old letters encased in clay envelopes.

Europe Created Heat-Wave Protections. Now Comes the ‘Crash Test.’

CHICO HARLAN

Searing temperatures in Western Europe are drawing comparisons to 2003, when a deadly heat wave sparked a reckoning.

Ebola Symptoms in Current Outbreak May Be Milder Than in Previous Ones

APOORVA MANDAVILLI

That is good news for patients, but officials fear it will make controlling the spread of the disease harder.

Former NOAA Employees Revive Climate.gov Web Site

QUINN GLABICKI

The database of federal global warming research recreates a website that was closed amid the administration’s broad retreat from climate science.

Energy Dept. Promises $17.5 Billion in Loans for Nuclear Power

BRAD PLUMER

The federal government wants to help utilities buy large components for up to 10 large nuclear reactors. It’s unclear which, if any, companies might participate.

How underappreciated mathematician Emmy Noether helped prove physics' most fundamental theories

Noether's work helped prove the conservation of energy in physics, a key foundation for Einstein's theory of relativity

An Influx of Climate Cash

DAVID GELLES

Many philanthropists are backing away from climate giving. But one is writing very big checks.