MICHAEL ZHANG, PETAPIXEL:
"When Adobe celebrated Photoshop’s 25th birthday back in February, one thing that flew under our radar was a fun little “Real or Photoshop” test that Adobe put up on its website.
"The site shows you 25 images, and your task is to figure out whether each one is an actual photograph or a faked picture that resulted from photo manipulation. Some are pretty obvious, while others may cause you to scratch your head."
To find out, click here.