The saga over face masks has been a tumultuous one as the global coronavirus pandemic has worn on.
In among the seriousness there’s room for a bit of light relief.
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‘To crack the puzzle above, focus your attention on one small section at a time—otherwise your noggin will lock in on the biggest parts of the picture and blur out everything else,’ explained Popular Science.
If you want to know where they all are, then just click this link.