Super-speedy light detector gives x-ray machines a run for their money
 

It's very tough to find light beyond certain frequencies. If you want to see elusive terahertz waves, for example, you have to get a system that's either really slow or needs to be kept at a temperature near absolute zero -- not exactly practical....

http://www.engadget.com/2014/09/08/g...=rss_truncated