Spot the hidden penguin among the ducks in this optical illusion and test your observation skills in 15 seconds ...
It's time now for our science news roundup from Short Wave, NPR's science podcast. I am joined by the show's host, Regina Barber, and producer Rachel Carlson. Good to have you both here. RACHEL ...
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22 mind-boggling optical illusions
Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...
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