Tuesday, Apr 23rd
Last update06:07:08 AM GMT
Science Glance
Some day soon, when pro-democracy campaigners have their cellphones confiscated by police, they'll be able to hit the "panic button" -- a special app that will both wipe out the phone's address book and emit emergency alerts to other activists.
The panic button is one of the new technologies the U.S. State Department is promoting to equip pro-democracy activists in countries ranging from the Middle East to China with the tools to fight back against repressive governments.
Nuclear scientists and policy experts say the quality and quantity of information coming out of Fukushima has left gaping holes in their understanding of the nuclear disaster nearly two weeks after it began.
At the same time, they say, the depth of the crisis has clearly been growing, judging by releases of radioactivity that by some measures have reached half the level of those released in the Chernobyl accident of 1986, according to new analysis by European and American scientists.
Mercury, the solar system's smallest planet, has gained a yearlong visitor from Earth - a spacecraft named Messenger that mission controllers guided successfully into a long, looping orbit around the planet Thursday night after a six-year flight across 4.9 billion miles of space.
For the first time, Messenger's polar orbit will enable Earth-bound scientists to see and analyze the planet's entire surface continuously, from distances as close as 124 miles and as far off as 9,420 miles.
UK researchers have demonstrated the highest-resolution optical microscope ever - aided by tiny glass beads. The microscope imaged objects down to just 50 billionths of a metre to yield a never-before-seen, direct glimpse into the "nanoscopic" world.
The team says the method could even be used to view individual viruses. Their technique, reported in Nature Communications, makes use of "evanescent waves", emitted very near an object and usually lost altogether.
As scientific mysteries go, this is the big one. How did life on Earth begin? Not how did life evolve, but how did it start in the first place? What was the initial spark that lit the fire of evolution?
Charles Darwin solved the mystery of life's wondrous diversity with his theory of natural selection. But even he was flummoxed by the ultimate mystery of mysteries: what led to the origin of life itself?
Some 11,500 years ago one of America's earliest families laid the remains of a 3-year-old child to rest in their home in what is now Alaska. The discovery of that burial is shedding new light on the life and times of the early settlers who crossed from Asia to the New World, researchers report in Friday's edition of the journal Science.
The bones represent the earliest human remains discovered in the Arctic of North America, a "pretty significant find," said Ben A. Potter of the University of Alaska Fairbanks.
Decades ago, a few astronomers began to suspect that the universe was swarming with some mysterious, invisible substance that was yanking galaxies around with its own powerful gravity. And for those same decades, most of those astronomers' colleagues dismissed the notion as pretty much nuts.
But the evidence kept mounting, and nowadays dark matter is a firmly established concept in modern astrophysics. It pretty much has to exist, in fact, to explain why individual galaxies spin as fast as they do without flying apart, and why groups of galaxies move the way they do in relation to one another.
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