25/09/2019

New species of crocodile discovered in museum collections

By this point, scientists have a pretty good handle on what kinds of big animals exist. Researchers still turn up new species of rats and insects, but most animals bigger than your hand are old news. But by looking at 90-year-old ...

Secure printing with water-based invisible ink

Researchers in China have developed a rewriteable paper coating that can encrypt secret information with relatively low-tech invisible ink—water. A message printed out by a water-jet printer on a manganese-complex-coated ...

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