NASA says it has found proof that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity (left). For comparison, the agency released an image of rocks from the Earth (right).
NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars, the agency announced today. NASA scientists say new photos from the rover show rocks that were smoothed and rounded by water. The rocks are in a large canyon and nearby channels that were cut by flowing water, making up an alluvial fan.
"You had water transporting these gravels to the downslope of the fan," NASA researchers say. The gravel then formed into a conglomerate rock, which was in turn likely covered before being exposed again.
Foodwise, we live in choosy times, mostly choosing "no thank you."
More and more of us choose not to eat meat or fish or eggs or fatty foods. We don't want anything too sugary, too fried, too raw, too strange. We tiptoe through the grocery as if it's a danger zone, hoping not to be tempted by a glazed doughnut.
On April 11 of this year, an extraordinary cluster of earthquakes struck off Sumatra. The largest shock, magnitude 8.7, produced stronger ground-shaking than any earthquake ever recorded. And it surprised seismologists by triggering more than a dozen moderate earthquakes around the world.
The quakes are also a sign of big changes to come in the Earth's crust.
One topic you don't hear much about from Republican presidential nominee Mitt Romney is climate change. Like so much else, it's become politically divisive, with polls showing Republicans far less likely to believe in it or support policies to address it.
But two new groups aim to work from within, using conservative arguments to win over skeptics.
This is ALL THINGS CONSIDERED from NPR News. I'm Melissa Block. It may indeed be lonely at the top, but apparently it's not as stressful as you might expect. New research finds that people in leadership positions show lower levels of stress and anxiety than workers further down the chain. Jennifer Lerner was on the research team at Harvard, which studied middle to high level officials from government, the military, business and nonprofits and she joins me to talk about what they found. Jennifer Lerner, welcome to the program.
Originally published on Fri September 28, 2012 2:51 pm
Cheryl Gleasner, a research technologist at the Los Alamos National Laboratory, works with a genome sequencing machine designed for disease surveillance. Since the SARS epidemic in 2003, advances in sequencing technologies have greatly speed up the ability to detect and track a new virus.
Credit Ross D. Franklin / AP
When an unknown virus emerges, disease detectives turn to gene sequencers — not magnifying glasses — to identify the culprit.
So when a new type of coronavirus killed a man in Saudia Arabia and hospitalized another in the U.K., investigators got cracking.
Scientists have discovered that a mouse found in Africa can lose large patches of skin and then grow it back without scarring, perhaps as a way of escaping the clutches of a predator.
The finding challenges the conventional view that mammals have an extremely limited ability to replace injured body parts. There are lizards that can regrow lost tails, salamanders that can replace amputated legs, and fish that can generate new fins, but humans and other mammals generally patch up wounds with scar tissue.
This spectacular image of the large spiral galaxy NGC 1232 was obtained by the European Southern Observatory's Very Large Telescope (VLT) in 1998. NGC 1232 sits in the constellation Eridanus (The River) at a distance of about 100 million light-years and is about twice the size of the Milky Way galaxy.
Where does the Universe end? Or, to put it differently, does the Universe have an edge? When cosmologists say that the Universe is expanding, people tend to think of an exploding bomb. They see galaxies as shrapnel, flying off in all directions. Even if intuitive, this image is dead wrong.
The cosmic expansion is an expansion of space itself. Since Einstein's theory of general relativity, space has been endowed with a plasticity that allows it to expand, shrink or fold like a rubber balloon in response to the presence of matter (and energy).