Pokémon experts have developed a unique cluster of brain cells devoted to recognising the hundreds of different characters in the famous video game. Author of the study Jesse Gomez explains what this reveals about the brain's ability to store and categorise information. (Image: 20 Pikachu characters. Credit: Yoshikazu Tsuno/Gamma-Rapho/Getty Images)
A study suggests "positive triggers" like smelling lemons and squeezing your ears could help revision.