A split screen image shows an encoder rat in Natal, Brazil and decoder rat in a lab at Duke University, North Carolina.

 
A split screen image shows an encoder rat in Natal, Brazil and decoder rat in a lab at Duke University, North Carolina.
A split screen image shows an encoder rat in Natal, Brazil and decoder rat in a lab at Duke University, North Carolina. REUTERS/Nicoleilis, Duke University/Handout
Tags: Brazil