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Can the sun be looked at without sun glasses in sand-obscured conditions?
I have seen several sandstorms that make the sun comfortable to look at directly, without the aid of sun glasses. Is this still dangerous, even in conditions (such as excessive dust in the air) where looking at the sun directly is not painful?
Well sand makes glass. So maybe they are natures "sunglasses". 
But in seriousness, the sand or dust can block SOME of the more harmfull rays emitted by the sun, but not all (not by filtering it, just from less rays hitting the eye in general). So, yes it still harmfull. But obviously reduced due to less rays going directly into the eye. But still, it is NOT good to stare directly into the sun with, or w/o sunglasses.
Researchers create incredibly thin solar cells flexible enough to wrap around a human hair (Engadget)
You've probably heard that the sun is strong enough to power our planet many
times over, but without a practical method of harnessing that energy, there's
no way to take full advantage. An incredibly thin and light solar cell could
go a long way to accomplishing that on a smaller scale, however, making the
latest device from researchers from the University of Austria and the
University of Tokyo a fairly significant discovery. Scientists were able to
create an ultra-thin solar cell that measures just 1.9 micrometers thick --
roughly one-tenth the size of the next device. Not only is the sample slim --
composed of electrodes mounted on plastic foil, rather than glass -- it's also
incredibly flexible, able to be wrapped around a single strand of human hair
(which, believe it or not, is nearly 20 times thicker). The scalable cell
could replace batteries in lighting, display and medical applications, and may
be ready to be put to use in as few as five years. There's a bounty of
physical measurement and efficiency data at the source link below, so grab
those reading glasses and click on past the break.
Researchers create incredibly thin ...
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