Left-handed people make up about 10% of the global population. They primarily use their left hand for tasks such as writing, eating, and throwing. This preference can be influenced by genetics and brain structure, as the brain's hemispheres control opposite sides of the body. Being left-handed can present unique challenges, especially in a world designed for right-handed individuals. For example, many tools, such as scissors and can openers, are made for right-handed use. Famous left-handed people include Leonardo da Vinci and Barack Obama, showcasing that left-handedness can be found in various fields, including art and politics.