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Ebola outbreak latest, World Cup heat risks and dad brains

What's going on with the Ebola outbreak, how the World Cup is dealing with rising temperatures, and how becoming a father can change your brain

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.