Which invisible ink pens are best? Spies and conspirators have used invisible inks for millennia to send messages. In the modern age, invisible ink pens are an excellent way for grown-ups to ...
Geek Life: Fun stories, memes, humor and other random items at the intersection of tech, science, business and culture. SEE MORE by Alan Boyle on Jan 7, 2016 at 6:50 pm January 7, 2016 at 6:50 pm ...
An invisible coating allows the surface of pills or sweets to be marked with a low-power laser. A small UK company has developed a range of food additives that allow a low-power laser to mark the ...
Which invisible ink pens are best? Spies and conspirators have used invisible inks for millennia to send messages. In the modern age, invisible ink pens are an excellent way for grown-ups to ...
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