Interested in ad-free access?
If you'd like to read ScienceDaily without ads, let us know
Follow ScienceDaily on Facebook, Twitter,
Recommend ScienceDaily on Facebook, Twitter, and Google +1:
Other bookmarking and sharing tools:
In Other News ...
At the high altitudes and latitudes commercial airlines fly, crews are subjected to higher-than-normal radiation levels from the sun and cosmic rays.. ... > full story
Get the latest science news with our free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:
... we want to hear from you!
Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?