Secure Printing Using Pure Water As Invisible Ink [Video]
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…
Nanjing University
Geologists Reveal Earth’s Inner Core Has an Inner Core of Its Own
New research from a team of geologists reveals that the Earth’s inner core has an inner core of its own, with crystals aligned in a…