NASA scientists find very strong evidence of flowing saltwater (“hydrated salts”) on Mars.

Image series: A light echo traveling through the dust cloud surrounding star V838 Monocerotis (May 2002 – Oct 2004).

Boeing publishes photos of secret 1960s stealth plane experiment

New Horizons: Pluto displays rippling terrain (new hires photos downloaded from probe)

Paraplegic man walks on his own legs thanks to computer system that reroutes brain signals to electrodes on his knees

NASA visualizes the supersonic shockwave of a jet eclipsing the sun

Photo, WW2: As Allies advanced on Florence, Italy, locals encased priceless art pieces (including Michelangelo’s David) in bricks to keep them safe.

Video: Flyover of Pluto generated from New Horizons still images.

Egypt Gives Green Light to Search for Nefertiti’s Burial Chamber in King Tut’s Tomb

Video: Cities, storms, and aurorae–HD time lapse footage from the ISS.

Palmerston: One of the most isolated island communities in the world. Population: 62

Image: US government mockups of how Hitler could have disguised himself to escape capture toward the end of the war.

They donut make them like they used to.

Meet Sir Vival, the safety car from a future that wasn’t.

Ligo begins “listening” for the gravitational waves flowing through the Earth when violent events occur in space.

Giraffes spend their evenings humming to each other

How Wasps Use Viruses to Genetically Engineer Caterpillars

What Happened When We Tried To Publish a Real Paper Investigating Time Travel

More on the ‘Fallen Astronaut’ sculpture

‘Fallen Astronaut’, a 3″ aluminum sculpture left on the moon by Apollo 15 astronauts to memorialize their fallen comrades.

Another batch of beautiful Pluto photos downloaded from NASA’s New Horizons

Video: What spoken English sounded like 500 years ago, prior to the Great Vowel Shift.

Using technology to attempt basic communication with dolphins.

Related to last: Reddit AMA with two of the “slender spelunkers” who excavated the cave where Homo naledi was found.

Documentary: The story of the recent discovery of Homo naledi deep in a cave in South Africa.

Extinct tree grows anew from ancient jar of seeds unearthed by archaeologists

Gallery: George Washington’s Annotated Copy of a Draft of the U.S. Constitution

Study: Vision comes at a surprising cost–5%-15% of an animal’s total energy budget.

Gigantic Ice Slab Found on Mars Just Below the Planet’s Surface.

Patient receives 3D-printed titanium sternum and rib cage.

Image gallery: Hi-res photos of Pluto, freshly downloaded from New Horizons probe.

New species of human relative, Homo naledi, discovered deep in a cave in South Africa.

Study: Whale vocalizations have varying dialects, and they are not innate, they must be learned.

NIST Physicists Show ‘Molecules’ Made of Light May Be Possible.

Ceres’ Bright Spots Seen in Striking New Detail.

Ancient Roman tag for a dog or slave: “Hold me, lest I flee, and return me to my master…”

New prion disease raises questions about whether Alzheimer’s and Parkinson’s could be infectious.

Image: Ground penetrating radar that purportedly shows the buried armored Nazi train in Poland.

Newly discovered 13.2 billion-year-old galaxy is the most distant galaxy ever seen, and theoretically should not be visible to us.

Researchers at Google and MIT have developed an algorithm to remove obstructions from photos.

The curious organisms and ecosystem of the long-isolated Movile Cave.

In new study, 100 percent of participants taking HIV prevention pill Truvada remained infection-free.

Men claiming they found Nazi train reveal themselves on Polish TV; claim it is buried, not in abandoned tunnel.

The Secret Story Of How Bubonic Plague Nearly Broke Out In New York City.

Video: Live interview interrupted by a blue whale.

Mathematician Alex Bellos demonstrates Loop, a variant of pool played on an elliptical table.

The Case for Complex Dark Matter.

Video: Self-balancing bicycle-riding robot.

Photo: 70 years ago today General Douglas MacArthur accepted the Japanese surrender aboard the USS Missouri, ending WW2.

How food coloring and water droplets help scientists understand how living cells work.

SubTropolis: The sprawling multipurpose underground complex below Kansas City.

Photo: Marathon Valley on Mars, as seen by NASA’s Opportunity rover, July 2015.

Video: “The Bomb,” a new PBS documentary on the nuclear bomb with restored/enhanced historical footage.

Quantum weirdness proved real in first loophole-free experiment.

Subatomic particles that appear to defy Standard Model points to undiscovered forces.

We will miss you deeply, Oliver Sacks.

Update on the found Nazi loot train: Its location is “near or under the famed Ksiaz Castle.”

Beautiful animation of the New Horizons Pluto flyby assembled from its images.

NASA’s New Horizons Team Selects Potential Kuiper Belt Flyby Target.

“Needle ice” forms when capillary action draws water from above-freezing soil into below-freezing air.