About turn: Alexander Maaß (front) and Ulrich Hirn from Graz University of Technology in Austria have discovered that solvents in the ink migrate through the paper towards the unprinted side over time, which causes it to curl (courtesy: Lunghammer - TU Graz)
You may have noticed that a sheet of paper that is printed on one side using an inkjet printer curls
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Michael Banks
is news editor of Physics World magazine