William Abel, a mail censor at Iowa's State Prison, Fort Madison, using a hot iron to bring out a secret message written in lemon juice on a letter.Three Lions/Getty Images Humans have had a long ...
My finger hovers over an iMessage obscured by a haze of dancing white dots. Before I tap to dissolve the sparkling pixels and reveal the contents of the message, I know it's going to be juicy, or at ...
A Japanese university student of ninja history got an “A” for handing in what appeared to be a blank paper but – her professor then realized – turned out was written using an old ninja technique: ...
SAN DIEGO--(BUSINESS WIRE)--VersaCheck.com is pleased to announce the launch of the “Stealth™ iX” invisible ink printer series, based on new proprietary Stealth™ iX invisible printing technology. The ...
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