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This October is on track to be the hottest ever recorded

Global projections suggest this October will be 1.76 degrees Celsius higher than preindustrial averages

‘Paleo lighting’ can fix your brain’s clock after daylight savings

The clocks falling back this weekend gives you the opportunity to sleep like a caveman

The world’s biggest cities are sinking. Is yours one of them?

Global cities are subsiding by up to several inches a year, an exhaustive new survey shows

Math Puzzle: Mysterious pyramid

Can you ascend this unusual pyramid?

How to ‘fall back’ this weekend without losing your mind

Time changes are more disruptive to our health than you might think. Here are some tips for a smooth transition

Boo! See the universe’s spookiest sights in time for Halloween

From ghosts to skeletons and even spiders, the cosmos is full of scary surprises

Doctors in Ukraine Try Treating Infections Like Biological Warfare Attacks

GINA KOLATA AND MARC SANTORA

As many as 40 percent of injured soldiers face severe infections that can lead to amputations and death. One initiative is trying to fix that.

How your brain can turn your own reflection into something unrecognizable

Staring at yourself in the mirror can create an illusionary effect, distorting your features to the point of appearing fantastical

A Meteorite Found in the Sahara Is a 4.1-Billion-Year-Old Piece of Mars

KENNETH CHANG

Minerals in the space rock provide hints about the early history of the red planet, when water was flowing on the surface.

Conservation Efforts for Caucasian Leopards Show Promise

ERIC NIILER

In Armenia, a three-legged Caucasian leopard’s astonishing hike signals that conservation efforts for the endangered animal may be working.

Three Stone Age Caves Reveal Continual Cannibalism

JOSHUA RAPP LEARN

A tour of the three caves in southern Spain suggests that people in the area cannibalized one another as funerary practice over many generations.

The New DNA Technology That Linked Ted Bundy to a 52-Year-Old Cold Case

ALEXANDER NAZARYAN

Software known as STRmix was instrumental in identifying Mr. Bundy’s DNA in a decades-old sample.

These Patients Struggle With Runaway Bones. Finally There’s Hope.

STELLA RAINE CHU

F.O.P., a rare genetic condition, causes uncontrolled explosions of bone. New drugs may slow or halt the process.

That Mummy for Sale on Facebook Could Make You Ill

FRANZ LIDZ

Experts warn that online black markets for mummified remains could pose health risks.

COP17 Biodiversity Talks in Yerevan, Armenia

CATRIN EINHORN

Countries renewed their promises to protect wildlife at U.N. talks in Armenia, but how to cover the costs remains a question.