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To See the Best Christmas Trees, You’ll Need Scuba Gear

To See the Best Christmas Trees, You’ll Need Scuba Gear

A Spirobranchus worm, commonly called the Christmas tree worm, on a coral reef near Eilat, Israel.

Newly Discovered ‘Limb Pit’ Reveals Civil War Surgeons’ Bitter Choices

Newly Discovered ‘Limb Pit’ Reveals Civil War Surgeons’ Bitter Choices

A field technician excavating the remains of an amputated limb at Manassas National Battlefield Park in October 2015. The discovery of two nearly complete sets of soldiers’ remains, 11 partial limbs and other artifacts appeared to date to the Second Battle of Bull Run, which ended Aug. 30, 1862.

A Hard Climate for Penguins and Butterflies

A Hard Climate for Penguins and Butterflies

These three Magellanic penguin chicks died of hypothermia after a rainstorm.

A Suitcase-Size Satellite’s Big Image of Frozen Earth Below

A Suitcase-Size Satellite’s Big Image of Frozen Earth Below

An image made by the Iceye-X1 satellite showing the Noatak National Preserve in northwest Alaska.

Visitors From the Ocean’s Twilight Zone

Visitors From the Ocean’s Twilight Zone

A transparent hatchetfish, retrieved by researchers from the Woods Hole Oceanographic Institution, which is seeking to understand better the creatures that occupy the sea from 600 to 3,300 feet deep.

Silicon Valley’s Water Conservation Conundrum

Silicon Valley’s Water Conservation Conundrum

­“Silicon Valley has been talking about water technology since they started talking about clean tech, but there are no new big ideas,” said Joel Makower, the chairman and executive editor of the GreenBiz Group.

Mars Is Frigid, Rusty and Haunted. We Can’t Stop Looking at It.

Mars Is Frigid, Rusty and Haunted. We Can’t Stop Looking at It.

A lunar eclipse, visible in Sumatra, Indonesia on Saturday, could be seen alongside Mars, which is the closest it's been to Earth in 15 years.

You Are Shaped by the Genes You Inherit. And Maybe by Those You Don’t.

You Are Shaped by the Genes You Inherit. And Maybe by Those You Don’t.

Graduation at City College in New York in 2016. A study in Iceland focusing on education suggests that parental genes may help determine how long children stay in school.

Boulder-Size Clues to How Humans Settled the Americas

Boulder-Size Clues to How Humans Settled the Americas

Alia Lesnek, left, and Charlotte Lindqvist of the University at Buffalo, observing boulders on Dall Island in Alaska. Scientists have found evidence in Alaska’s rocks that the first people to populate the Americas were island-hopping sea-farers.

3.6 Degrees of Uncertainty

3.6 Degrees of Uncertainty

Icebergs near Greenland's glaciers, which are speeding up as the climate warms.

Largest King Penguin Colony in the World Drops by 90%

Largest King Penguin Colony in the World Drops by 90%

The colony of king penguins on the Île aux Cochons, or Pig Island, in 1982, when researchers last counted its population.

Bird’s Extinction Is Tied to the Arrival of Humans

Bird’s Extinction Is Tied to the Arrival of Humans

There were nine species of the flightless birds called the moa.

A Crispr Conundrum: How Cells Fend Off Gene Editing

A Crispr Conundrum: How Cells Fend Off Gene Editing

Embryonic stem cells surrounded by feeder cells. When a team of scientists tried using Crispr to turn stem cells into neurons, they found that many of them died unless a cancer-fighting gene also was deactivated.

The Sounds That Haunted U.S. Diplomats in Cuba? Lovelorn Crickets, Scientists Say

The Sounds That Haunted U.S. Diplomats in Cuba? Lovelorn Crickets, Scientists Say

Scientists say a recording of disturbing sounds made by American diplomats in Cuba actually may be of a very loud cricket species.

Creatures, Strange and Complex, in Colorful Detail

Creatures, Strange and Complex, in Colorful Detail

A change encounter with the colors of a squid.

Archaeologists in China Discover the Oldest Stone Tools Outside Africa

Archaeologists in China Discover the Oldest Stone Tools Outside Africa

One of the 2.1 million-year-old artifacts, right, recovered from a gully in western China, left, suggest that hominins may have left Africa far earlier than previously believed.


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