Spot the difference puzzles challenge the readers to identify the differences between two images that look nearly identical at first glance. These differences can be as subtle as a change in shape, ...

Spot the difference puzzles are excellent for testing the observation skills and memory power of an individual. These present readers with two identical pictures, and the challenge for the readers is ...

Sexual size differences are widespread in biology, yet the "how" behind them often remains vague. We asked a concrete question in a classic model organism: when female flies are larger than males, do ...