A new study exploring handedness has identified a potential link between brain size and the preference for right or left-handedness. Analyzing over 2,000 individuals from 41 species of monkeys and apes, researchers found that while most species exhibit ambidexterity, humans predominantly favor their right hand. This trend appears to have evolved alongside increasing brain size in our ancestors. Neanderthals, for instance, were mostly right-handed, and the preference for right-handedness became more pronounced as species evolved closer to modern humans, particularly in Homo ergaster and Homo erectus. The study suggests that the ability to pick one side over the other may improve survival rates by facilitating tool use and complex motor skills. Additionally, the researchers noted that cultural factors may have further influenced this evolutionary trend. However, the presence of left-handed individuals remains an intriguing mystery, prompting further investigation into the reasons behind this divergence.