Getting through airport security can be a real pain most of the time. One of the many inconviences is having to take your shoes off to have them checked. Well that may now be a thing of the past. Researchers at Argonne national Labratory have developed a t-ray(terahertz radiation) scanner that is able to see through many common materials like leather, cotton, etc. T-rays have a low energy so they are believed to be harmless.
http://www.news.com/Keep-your-shoes-on-T-rays-can-see-right-through/2100-1008_3-6220383.html?tag=nefd.top
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