Gareth Moore (Author) Dr Gareth Moore (B.Sc (Hons) M.Phil Ph.D) is the internationally bestselling author of a wide range of brain-training and puzzle books for both children and adults, including Anti-stress Puzzles, Ultimate Dot to Dot, Brain Games for Clever Kids®, Lateral Logic, Extreme Mazes and The Ordinance Survey Puzzle Book. His books have sold over a million copies in the UK alone and have sold in thirty-five different languages. He is also the creator of online brain-training site BrainedUp.com and runs the daily puzzle site PuzzleMix.com.

Mateo Sanchez (Author) Dr Mateo Sanchez is a genetic engineer and chemical biologist with a PhD in organic chemistry from the University of Santiago de Compostela. He currently has his own laboratory at Cambridge University, which focuses on researching age-related DNA repair mechanisms and possible future treatments for age-related diseases such as Alzheimer's and dementia. Prior to launching his lab, Dr Sanchez was a postdoctoral researcher at the Massachusetts Institute of Technology (MIT) and Stanford University, where he focused on genetic engineering, as well as Imperial College London, where he researched artificial chromosomes and synthetic genomes. www.mateosanchezlab.com.