Interesting

http://discovermagazine.com/photos/15-how-to-build-a-telescope-even-more-powerful-than-hubble
http://www.nature.com/news/2011/110406/full/news.2011.215.html
http://www.popularmechanics.com/technology/engineering/extreme-machines/questions-for-graham-hawkes-the-man-who-built-the-deep-flight-challenger-submersible?click=pm_latest
http://www.physorg.com/news/2011-04-true-color-d-holograms.html