Optical Illusion Eye Test: Can You Spot the Inverted 55 and 53 Among 35s?

This viral optical illusion hides an inverted 55 and a 53 among dozens of 35s. Can you spot them before time runs out, or ...
C&EN

Rheology Study of Silica−Zirconia Sols for Elaboration of Silica−Zirconia Nanostructured Optical Fibers by Inverse Dip Coating

XLIM Research Institute-UMR CNRS, 123 Avenue Albert Thomas, 87000 Limoges, France and University Institute of Technology, Allée A Maurois, 87000 Limoges, France * To whom correspondence should be ...