- Auroras on Mars
- Mars rover's laser-zapping instrument gets sharper vision
- Curiosity rover adjusts route up Martian mountain
- 'Deep web search' may help scientists
- Birds 'weigh' peanuts and choose heavier ones
- From chicken to dinosaur: Scientists experimentally 'reverse evolution' of perching toe
- Vaccines developed for H5N1, H7N9 avian influenza strains
Posted: 23 May 2015 07:21 AM PDT
One day, when humans go to Mars, they might find that, occasionally, the Red Planet has green skies. NASA's MAVEN spacecraft has detected evidence of widespread auroras in Mars's northern hemisphere. Unlike Earth, Mars does not have a global magnetic field that envelops the entire planet. Instead, Mars has umbrella-shaped magnetic fields that sprout out of the ground like mushrooms, here and there, but mainly in the southern hemisphere. These umbrellas are remnants of an ancient global field that decayed billions of years ago.
Posted: 23 May 2015 07:17 AM PDT
Posted: 23 May 2015 07:14 AM PDT
Posted: 23 May 2015 07:09 AM PDT
When you do a simple Web search on a topic, the results that pop up aren't the whole story. The Internet contains a vast trove of information -- sometimes called the "Deep Web" -- that isn't indexed by search engines: information that would be useful for tracking criminals, terrorist activities, sex trafficking and the spread of diseases. Scientists could also use it to search for images and data from spacecraft.
Posted: 22 May 2015 02:47 PM PDT
Posted: 22 May 2015 02:45 PM PDT
A unique adaptation in the foot of birds is the presence of a thumb-like opposable toe, which allows them to grasp and perch. However, in their dinosaur ancestors, this toe was small and non- opposable, and did not even touch the ground, resembling the dewclaws of dogs and cats. Remarkably, the embryonic development of birds provides a parallel of this evolutionary history: The toe starts out like their dinosaur ancestors, but then its base (the metatarsal) becomes twisted, making it opposable.
Posted: 22 May 2015 12:23 PM PDT
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