What is real is not always as it appears. Researchers have found a way to hide information on materials and only make it visible to a person using the right tech.
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2018/12/181217105845.htm
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2018/12/181217105845.htm
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