Optical illusion: Only a person with perfect eyesight can spot the cute penguin in 6 seconds
Test your visual skills with this optical illusion, where a hidden penguin blends in among brightly colored toucans. You have ...
Scientific American19 天
Penguins Help to Map Antarctica’s Growing Mercury Threat
When Philip Sontag first visited Antarctica as a Ph.D. student, he brought back an unusual souvenir: a huge bag of penguin ...