Test your observation skills with this optical illusion challenge! Spot the hidden owl in a pattern of birch trees.

pylori infection. Magnifying endoscopy can reveal more precisely the abnormal mucosal patterns in an H. pylori-infected stomach; however, it requires more training, expertise, and time.

IQ tests and brain teasers put our mental skills to the test, challenging us with abilities such as logical reasoning, ...

Shifting precipitation patterns are producing stronger rainstorms ... analyzed two decades of field and satellite observations, spanning millions of square miles. Their study area encompassed ...

Optical illusions are incredible brain teasers that put your observation skills to the test and question your pattern recognition skills. In this thri ...