Can you find them all? Optical illusions offer intriguing ... A viral optical illusion, for instance, hides animal faces ...

Readers are challenged to find all the animals within nine seconds ... Try out this fun brain puzzle that’s more than just a simple picture! At first glance, this intricate black-and-white ...

All can breathe and absorb water through their ... Some transport water, oxygen, and carbon dioxide either into or out of the animal. Others fight bacteria or fungal infections.