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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.

A Loophole Brings Cystic Fibrosis Patients a ‘Miracle Drug’ in Generic Form

STEPHANIE NOLEN

A generic version of a breakthrough cystic fibrosis drug, manufactured in Bangladesh for a fraction of the American price, may give some families around the world an unlikely lifeline.

Extreme heat is muddling animals’ brains—and even triggering aggression

As temperatures rise, some creatures pick fights while others struggle to learn