A type of paper that has the thermal properties of glass but is flexible, foldable and optically transparent has been fabricated by scientists in Japan (Adv. Mater. 21, 1595–1598; 2009). The key to ...
You might have wondered why a cheesesteak bag or a pizza box becomes slightly see-through when touched by its greasy contents. To understand why, we need to understand how light interacts with matter.
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